'Failing' in the Bible

'And among those nations thou dost not rest, yea, there is no resting-place for the sole of thy foot, and Jehovah hath given to thee there a trembling heart, and failing of eyes, and grief of soul;

Why hath my pain been perpetual? And my wound incurable? It hath refused to be healed, Thou art surely to me as a failing stream, Waters not stedfast.

looking diligently over lest any one be failing of the grace of God, lest any root of bitterness springing up may give trouble, and through this many may be defiled;