adj. 25B6; adjective
these drugs can be deadly : FATAL, lethal, mortal, death-dealing, life-threatening; dangerous, injurious, harmful, detrimental, deleterious, unhealthy; noxious, toxic, poisonous; poetic/literary deathly.
deadly enemies : MORTAL, irreconcilable, implacable, unappeasable, unforgiving, remorseless, merciless, pitiless; bitter, hostile, antagonistic.
deadly seriousness : INTENSE, great, marked, extreme.
he was deadly pale : DEATHLY, ghostly, ashen, white, pallid, wan, pale; ghastly.
his aim is deadly : UNERRING, unfailing, impeccable, perfect, flawless, faultless; sure, true, precise, accurate, exact; Brit. informal spot on, bang on.
(informal) life here can be deadly. : See boring .
harmless, mild, inaccurate, exciting.
25B6; adverb deadly calm : COMPLETELY, absolutely, totally, utterly, perfectly, entirely, wholly, quite, dead, thoroughly; in every way, one hundred per cent, to the hilt.