dangerous

Synonyms: alarming bad breakneck chancy critical dangersome deadly delicate dynamite exposed fatal formidable hairy heavy hot impending impregnable insecure jeopardous loaded malignant menacing mortal nasty on collision course parlous perilous portentous precarious pressing queasy risky serious serpentine shaky speculative terrible thorny threatening ticklish touch-and-go touchy treacherous ugly unhealthy unsafe unstable urgent viperous vulnerable wicked

Antonyms: careful guarded safe secure unhazardous untroubled