[ἀκαιρέομαι] from a compound of G1 (as a negative particle) and G2540 (meaning unseasonable); to be inopportune (for oneself), i.e. to fail of a proper occasion
Usages throughout the bible
Philippians 4:10
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But I rejoiced in the Lord greatly, that now at the last your care of me hath flourished again; wherein ye were also careful, but ye lacked opportunity. G170