(a.) Attended with risk or danger; hazardous.

accidental adventitious adventurous aleatory blue broad casual causeless chance chancy contingent dangerous delicate destinal desultory dicey fatal fatidic fluky fortuitous full of risk hairy hazardous iffy incidental indeterminate infirm insecure insubstantial jeopardous off-color on thin ice perilous precarious provisional racy riskful risque salty scabrous sensitive shady shaky shifting shifty slippery speculative spicy suggestive temporary tentative ticklish touch-and-go touchy treacherous uncaused uncertain undependable undetermined unexpected unfaithworthy unforeseeable unforeseen unhealthy unlooked-for unpredictable unreliable unsolid unsound unstable unsteadfast unsteady unsubstantial unsure untrustworthy venturesome venturous wicked wildcat