G0801
ἀσύνετος
senseless
ἀ-σύνετος, -ον [in LXX: Deu.32:21 (נָבָל). Job.13:2 (נָפַל), Psa.92:6 (כְּסִיל), Psa.76:5, Wis.2:1-24, Sir.6:1-37 * ;] without understanding or discernment: Mat.15:16, Mrk.7:18 (Swete, in l), Rom.1:21, 31 10:19 (for an ex. of its use in the moral sense, see MM, see word).† (AS)
Full Thayer's lexicon entry
ἀσύνετος — asýnetos
ἀσύνετος, ἀσύνετον, unintelligent, without understanding: Mat 15:16; Mar 7:18; stupid: Rom 1:21; Rom 10:19. In imitation of the Hebrew נָבָל, ungodly (Wis 1:5; Sir 15:7 f (cf. ἀσυνέτειν, Psalm 118:158 )), because a wicked man has no mind for the things which make for salvation: Rom 1:31 (others adhere here to the Greek usage; cf. Fritzsche at the passage). (In Greek writings from Herodotus down.) (Cf. σοφός, at the end).
5 occurrences
Matthew (1), Mark (1), Romans (3)