A — 1: ἐκλείπω
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(Strong's #1587 — Verb — ekleipo — ek-li'-po )

"to leave out" (ek, "out," leipo, "to leave"), used intransitively, means "to leave off, cease, fail;" it is said of the cessation of earthly life, Luke 16:9; of faith, Luke 22:32; of the light of the sun, Luke 23:45 (in the best mss.); of the years of Christ, Hebrews 1:12 .

A — 2: ἐπιλείπω
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(Strong's #1952 — Verb — epileipo — ep-ee-li'-po )

"not to suffice for a purpose" (epi, over), is said of insufficient time, in Hebrews 11:32 .

A — 3: πίπτω
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(Strong's #4098 — Verb — pipto — pip'-to, pet'-o )

"to fall," is used of the Law of God in its smallest detail, in the sense of losing its authority or ceasing to have force, Luke 16:17 . In 1—Corinthians 13:8 it is used of love (some mss. have ekpipto, "to fall off"). See FALL.

1—Corinthians 13:8Hebrews 12:15Luke 21:26FAINT.
B — 1: ἀνέκλειπτος
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(Strong's #413 — Adjective — anekleiptos — an-ek'-lipe-tos )

"unfailing" (a, negative, and A, No. 1), is rendered "that faileth not," in Luke 12:33 . In a Greek document dated A.D. 42, some contractors undertake to provide "unfailing" heat for a bath during the current year (Moulton and Milligan, Vocab.).