adj. extremely impressive in strength or excellence; "a formidable opponent"; "the challenge was formidable"; "had a formidable array of compositions to his credit"; "the formidable army of brains at the Prime Minister's disposal"

adj. inspiring fear; "the formidable prospect of major surgery"; "a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic"- G.H.Johnston; "something unnerving and prisonlike about high grey wall"

adj. impressively difficult; "a tall order"

adj. inspiring awe or admiration or wonder; "New York is an amazing city"; "the Grand Canyon is an awe-inspiring sight"; "the awesome complexity of the universe"; "this sea, whose gently awful stirrings seem to speak of some hidden soul beneath"- Melville; "Westminster Hall's awing majesty, so vast, so high, so silent"

adj. immune to attack; impregnable; "gunners raked the beach from invulnerable positions on the cliffs"

adj. impossible to subdue

adj. incapable of being overcome or subdued; "an invincible army"; "her invincible spirit"

adj. characterized by toilsome effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"

adj. not easily borne; wearing; "the burdensome task of preparing the income tax return"; "my duties weren't onerous; I only had to greet the guests"; "a taxing schedule"

adj. disagreeable to the senses; "the harsh cry of a blue jay"; "harsh cognac"; "the harsh white light makes you screw up your eyes"; "harsh irritating smoke filled the hallway"

adj. (of weapons or instruments) causing suffering and pain; "brutal instruments of torture"; "cruel weapons of war"

adj. severely simple; "a stark interior"

adj. not forbearing; ruthless; "an unsparing critic"

adj. unsparing and uncompromising in discipline or judgment; "a parent severe to the pitch of hostility"- H.G.Wells; "a hefty six-footer with a rather severe mien"; "a strict disciplinarian"; "a Spartan upbringing"

adj. having or wielding force or authority; "providing the ground soldier with increasingly potent weapons"

adj. incapable of being surmounted or excelled; "insuperable odds"; "insuperable heroes"

adj. not to be exceeded; "unsurpassable skill"; "unsurpassable standards of workmanship"

adj. causing consternation; "appalling conditions"

adj. provoking horror; "an atrocious automobile accident"; "a frightful crime of decapitation"; "an alarming, even horrifying, picture"; "war is beyond all words horrible"- Winston Churchill; "an ugly wound"

adj. causing fear or dread or terror; "the awful war"; "an awful risk"; "dire news"; "a career or vengeance so direful that London was shocked"; "the dread presence of the headmaster"; "polio is no longer the dreaded disease it once was"; "a dreadful storm"; "a fearful howling"; "horrendous explosions shook the city"; "a terrible curse"

adj. threatening or foreshadowing evil or tragic developments; "a baleful look"; "forbidding thunderclouds"; "his tone became menacing"; "ominous rumblings of discontent"; "sinister storm clouds"; "a sinister smile"; "his threatening behavior"; "ugly black clouds"; "the situation became ugly"

adj. extremely alarming

adj. so scary as to cause chills and shudders; "the most terrible and shuddery...tales of murder and revenge"

adj. causing a sensation as of things crawling on your skin; "a creepy story"; "I had a creepy-crawly feeling"

adj. shockingly repellent; inspiring horror; "ghastly wounds"; "the grim aftermath of the bombing"; "the grim task of burying the victims"; "a grisly murder"; "gruesome evidence of human sacrifice"; "macabre tales of war and plague in the Middle ages"; "macabre tortures conceived by madmen"

adj. hazardous and frightening; "hairy moments in the mountains"

adj. causing extreme terror; "a terrifying wail"

adj. requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"

adj. making great mental demands; hard to comprehend or solve or believe; "a baffling problem"; "I faced the knotty problem of what to have for breakfast"; "a problematic situation at home"

adj. having concealed difficulty; "a catchy question"; "a tricky recipe to follow"

adj. difficult to handle; requiring great tact; "delicate negotiations with the big powers";"hesitates to be explicit on so ticklish a matter"; "a touchy subject"

adj. causing vexation or worry: "trying times"; "serious problems"

adj. extremely difficult; requiring the strength of a Hercules; "a herculean task"

adj. hard to manage; inclined to make trouble: "a difficult child"

adj. requiring great effort; "a hard-fought primary"

adj. very unpleasant; "hellish weather"; "stop that god-awful racket"

adj. exasperatingly difficult to handle or circumvent; "a nasty problem"; "a good man to have on your side in a tight situation"

adj. full of hardship or trials; "the rocky road to success"; "they were having a rough time"

adj. causing difficulty in finding an answer or solution; much disputed; "the vexed issue of priorities"; "we live in vexed and troubled times"

adj. commanding attention; "an arresting drawing of people turning into animals"; "a sensational concert--one never to be forgotten"; "a stunning performance"

adj. impressive in appearance; "a baronial mansion"; "an imposing residence"; "a noble tree"; "severe-looking policemen sat astride noble horses"; "stately columns"

adj. sensational in appearance or thrilling in effect; "a dramatic sunset"; "a dramatic pause"; "a spectacular display of northern lights"; "it was a spectacular play"; "his striking good looks always created a sensation"

adj. of behavior that is impressive and ambitious in scale or scope; "an expansive lifestyle"; "in the grand manner"; "collecting on a grand scale"; "heroic undertakings"

adj. having or displaying great dignity or nobility; "a gallant pageant"; "lofty ships"; "majestic cities"; "proud alpine peaks"

adj. impressive because of unnecessary largeness or grandeur; used to show disapproval

adj. of behavior that is impressive and ambitious in scale or scope; "an expansive lifestyle"; "in the grand manner"; "collecting on a grand scale"; "heroic undertakings"

adj. impressive in appearance

adj. intellectually or emotionally overwhelming; "a mind-boggling display"; "a mind-boggling puzzle"

adj. suitable for or like a palace; "palatial furnishings"; "a palatial yacht"

adj. notably out of the ordinary; "the year saw one signal triumph for the Labour party"

adj. extraordinarily big or impressive; "a thundering success"; "the thundering silence of what was left unsaid"

adj. posing no difficulty; requiring little effort; "an easy job"; "an easy problem"; "an easy victory"; "the house is easy to heat"; "satisfied with easy answers"; "took the easy way out of his dilemma"

adj. attractive and tempting; "an inviting offer"

adj. not capable of impressing

adj. depressing to the spirit; "a villa of uninspiring design"