Abbott-Smith Manual Greek Lexicon
ψυχρός (G5593)
4 ψυχρός , -ά, -όν ( ψύχω ), [in LXX: Pr 25:25 ( קַר ), Si 43:20 , IV Mac 11:26 * ;] cold : sc. ὕδωρ (cf. Theogn., 263; Hdt., ii, 37), Mt 10:42 ; metaph., of indifferent persons, Re 3:15 , 16 †
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain