risky

Synonyms: chancy delicate dicey endangered fraught with danger going for broke hairy hanging by a thread hazardous iffy insecure jeopardous long shot not a prayer off the deep end on slippery ground on the spot on thin ice out on a limb perilous playing with fire precarious rocky sensitive speculative ticklish touchand-go touchy treacherous tricky uncertain unhealthy unsafe unsound venturesome wicked wide-open

Antonyms: assured certain safe sure