impregnable Antonyms

on a shoogly peg dodgy high-risk vulnerable vacillant powerless pliable perilous negotiable defenceless chancy in jeopardy caught lacking at hazard potentially dangerous unsustainable on thin ice down for the count dicey mauled imperiled helpless defenseless deadly dangerous conquerable breakable bendable attackable aidless destructible endangered hazardous hairy guideless frail fragile extinguishable expugnable exposed absorbent