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adj.
not tractable; difficult to manage or mold; "an intractable disposition"; "intractable pain"; "the most intractable issue of our era"; "intractable metal"
adj.
quibbling over insignificant details; "caviling pettifoggers and quiggling pleaders"-Edmund Burke; "her nagging and carping attack"; "thought her editor unnecessarily nitpicking"; "a pettifogging lawyer's mind"; "had no patience with quibbling critics"
adj.
stubbornly unyielding; "dogged persistence"; "dour determination"; "the most vocal and pertinacious of all the critics"; "a mind not gifted to discover truth but tenacious to hold it"- T.S.Eliot; "men tenacious of opinion"
adj.
showing a brooding ill humor; "a dark scowl"; "the proverbially dour New England Puritan"; "a glum, hopeless shrug"; "he sat in moody silence"; "a morose and unsociable manner"; "a saturnine, almost misanthropic young genius"- Bruce Bliven; "a sour temper"; "a sullen crowd"