List of perilous synonyms and perilous related words.
alarming, bad, chancy, critical, dangerous, dangersome, delicate, desultory, explosive, fraught with danger, hairy, hazardous, infirm, insecure, insubstantial, jeopardous, menacing, parlous, periculous, precarious, provisional, risky, serious, shaky, shifting, shifty, slippery, susceptible, temporary, tentative, threatening, ticklish, tottery, touchy, treacherous, ugly, uncertain, undependable, unfaithworthy, unhealthy, unreliable, unsafe, unsolid, unsound, unstable, unsteadfast, unsteady, unsubstantial, unsure, untrustworthy, vulnerable, wicked