From a (as a negative particle) and the base of sthenoo; strengthless (in various applications, literal, figurative and moral) -- more feeble, impotent, sick, without strength, weak(-er, -ness, thing).
see GREEK a
see GREEK sthenoo
a. universally: Matthew 26:41; Mark 14:38; 1 Peter 3:7; τό ἀσθενές τοῦ Θεοῦ, the act of God in which weakness seems to appear, viz. that the suffering of the cross should be borne by the Messiah, 1 Corinthians 1:25.
b. specifically: contextually, unable to achieve anything great, 1 Corinthians 4:10; destitute of power among men, 1 Corinthians 1:27 (Lachmann brackets); weaker and inferior, μέλος, 1 Corinthians 12:22; sluggish in doing right, Romans 5:6; lacking in manliness and dignity, 2 Corinthians 10:10; used of the religious systems anterior to Christ, as having no power to promote piety and salvation, Galatians 4:9; Hebrews 7:18; lacking in decision about things lawful and unlawful (see ἀσθενέω), 1 Corinthians 8:7, 9 L T Tr WH,