Deadly

King James Dictionary

DEAD'LY, a. ded'ly.

Vine's Expository Dictionary of NT Words

1: Θανατηφόρος

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(Strong'S #2287 — Adjective — thanatephoros — than-at-ay'-for-os )

lit., "death-bearing, deadly" (thanatos, "death," phero, "to bear"), is used in James 3:8 . In the Sept., Numbers 18:22; Job 33:23 .

2: Θανάσιμος

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(Strong'S #2286 — Adjective — thanasimos — than-as'-ee-mos )

from thanatos (see No. 1), "belonging to death, or partaking of the nature of death," is used in Mark 16:18 .

International Standard Bible Encyclopedia

ded´li : In the Old Testament two words are used in the sense of a "mortal (Hebrew nephesh , "hateful," "foul") enemy" ( Psalm 17:9 ), and in the sense of "fatal disease," the destructiveness of which causes a general panic (Hebrew māweth , "death," 1 Samuel 5:11 ).

In the New Testament we have in Revelation 13:3 , Revelation 13:12 the expression "deadly wound" (Greek thánatos ), better "death-stroke," as in the Revised Version (British and American), and the phrases "deadly thing," i.e. poison ( θανασιμον τι , thanásimón ti , Mark 16:18 ), and "full of deadly poison" ( mestḗ ioú thanatēphórou , James 3:8 ), said of an unruly tongue. Both Greek words convey the idea of "causing or bringing death" and occur in classical literature in a variety of uses in combination with the bite of venomous reptiles, deadly potions, mortal wounds and fatal contagion.