The Greek adjective aklinēs (ἀκλινής) means unbending, unwavering, not leaning, not deviating — composed of the alpha-privative and klinō (to lean, incline, bend). It appears in the exhortation to hold the confession of hope without wavering.
Hebrews 10:23 calls believers to hold fast their hope without wavering, grounded in the faithfulness of God who promised. Perseverance in faith is not mere willpower — it is trust in the unchanging character of God. The anchor of hope holds fast within the veil, where Christ our forerunner has entered (Hebrews 6:19–20).