1: ἄλογος
(Strong's #249 — Adjective — alogos — al'-og-os )

"without reason, irrational," is rendered "unreasonable" in Acts 25:27 . See BRUTE.

2: ἄτοπος
(Strong's #824 — Adjective — atopos — at'-op-os )

lit., "out of place" (topos, "a place"), is translated "unreasonable" in 2Thess.3:2, where the meaning intended seems to be "perverse, truculent." See AMISS.