adj. without hope of solution; "an insoluble problem"

adj. (of a substance) incapable of being dissolved

adj. admitting of no solution or explanation; "an insoluble doubt"

adj. of an obscure nature; "the new insurance policy is written without cryptic or mysterious terms"; "a deep dark secret"; "the inscrutable workings of Providence"; "in its mysterious past it encompasses all the dim origins of life"- Rachel Carson; "rituals totally mystifying to visitors from other lands"

adj. not clear to the understanding; "I didn't grasp the meaning of that enigmatic comment until much later"; "prophetic texts so enigmatic that their meaning has been disputed for centuries"

adj. of depth; not capable of being sounded or measured

adj. impossible to understand; "impenetrable jargon"

adj. lacking clarity of meaning; causing confusion or perplexity; "sent confusing signals to Iraq"; "perplexing to someone who knew nothing about it"; "a puzzling statement"

adj. showing utter resignation or hopelessness; "abject surrender"

adj. offering little or no hope; "the future looked black"; "prospects were bleak"; "Life in the Aran Islands has always been bleak and difficult"- J.M.Synge; "took a dim view of things"

adj. without or almost without hope; "despondent about his failure"; "too heartsick to fight back"

adj. "a hopeless attempt"

adj. having no prospect or hope of a future

adj. characterized by hopelessness; filled with gloom; "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"; "took a grim view of the economy"; "the darkening mood"

adj. unable to function; without help

adj. "a hopeless case"

adj. incapable of being explained or accounted for; "inexplicable errors"; "left the house at three in the morning for inexplicable reasons"

adj. (of a substance) capable of being dissolved in some solvent (usually water)

adj. susceptible of solution or of being solved or explained; "the puzzle is soluble"