G0249
ἄλογος
unreasonable
ἄ-λογος, -ον [in LXX: Exo.6:12 (שָׂפָה עָרֵל), Num.6:12 (נָפַל), Job.11:12, Wis.11:15-16, 4Ma.3:1-21 * ;] __1. without reason, irrational: ζῷα, 2Pe.2:12, Ju 10. __2. contrary to reason: Act.25:27 (see MM, VGT, see word).† (AS)
Full Thayer's lexicon entry
ἄλογος — álogos
ἄλογος, (λόγος, reason);
1. destitute of reason, brute: ζῷα, brute animals, Jud 1:10; 2Pe 2:12 (Wis 11:16; Xenophon, Hier. 7, 3, others).
2. contrary to reason, absurd: Act 25:27 (Xenophon, Ages. 11, 1; Thucydides 6, 85; often in Plato, Isocrates, others).
3 occurrences
Acts (1), II Peter (1), Jude (1)