DEAD'LY, adjective ded'ly. 1. That may occasion death; mortal; fatal; destructive; as a deadly blow or wound. 2. Mortal; implacable; aiming to kill or destroy; as a deadly enemy; deadly malice a deadly feud. DEAD'LY, adverb ded'ly. In a manner resembling death; as deadly pale or wan. 2. Mortally. With groanings of a deadly wounded man. Ezekiel 30:24. 3. Implacably; destructively. 4. In a vulgar or ludicrous sense, very; extremely; as a deadly cunning man.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI