Strong's Concordance

Original word: ἄλογος
Transliteration: alogos
Definition (short): unreasoning
Definition (full): without reason

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix) and logos
Definition: without reason
NASB Translation: absurd (1), unreasoning (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a (as a negative particle) and logos; irrational -- brute, unreasonable.

see GREEK a

see GREEK logos

KJV: For it seemeth to me unreasonable to send a prisoner, and not withal to signify the crimes laid against him.
NASB: "For it seems absurd to me in sending a prisoner, not to indicate also the charges against him."
KJV: But these, as natural brute beasts, made to be taken and destroyed, speak evil of the things that they understand not; and shall utterly perish in their own corruption;
NASB: But these, like unreasoning animals, born as creatures of instinct to be captured and killed, reviling where they have no knowledge, will in the destruction of those creatures also be destroyed,
KJV: But these speak evil of those things which they know not: but what they know naturally, as brute beasts, in those things they corrupt themselves.
NASB: But these men revile the things which they do not understand; and the things which they know by instinct, like unreasoning animals, by these things they are destroyed.