ταχύςtachýs, takh-oos'; of uncertain affinity; fleet, i.e. (figuratively) prompt or
ready:—swift.
Thayer's Greek Lexicon
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STRONGS G5036:
ταχύς, ταχεῖα, ταχύ, from Homer down, quick, fleet, speedy: opposed to βραδύς (as in Xenophon, mem. 4, 2, 25), εἰςτόἀκοῦσαι (A. V.swift to hear), James 1:19.