ἄφρων properly, mindless, i.e. stupid, (by implication) ignorant, (specially) egotistic, (practically) rash, or (morally) unbelievingDerivation: from G1 (as a negative particle) and G5424;KJV Usage: fool(-ish), unwise. G1 G5424
Thayer:1) without reason 2) senseless, foolish, stupid 3) without reflection or intelligence, acting rashly
ἄφρων aphrōn af'-rone From G1 (as a negative particle) and G5424; properly mindless, that is, stupid, (by implication) ignorant, (specifically) egotistic, (practically) rash, or (morally) unbelievingKJV Usage: fool (-ish), unwise.