denotes (a) "to loose, release" (ek, "out," luo, "to loose"); (b) "to unloose," as a bow-string, "to relax," and so, "to enfeeble," and is used in the Passive Voice with the significance "to be faint, grow weary," (1) of the body, Matthew 15:32; (some mss. have it in Matthew 9:36 ); Mark 8:3; (2) of the soul, Galatians 6:9 (last clause), in discharging responsibilities in obedience to the Lord; in Hebrews 12:3 , of becoming weary in the strife against sin; in Hebrews 12:5 , under the chastening hand of God. It expresses the opposite of anazonnumi, "to gird up," 1 Peter 1:13 .

2: ἐκκακέω

(Strong's #1573 — Verb — enkakeo | ekkakeo — ek-kak-eh'-o )

"to lack courage, lose heart, be fainthearted" (en, "in," kakos, "base"), is said of prayer, Luke 18:1; of Gospel ministry, 2 Corinthians 4:1,16; of the effect of tribulation, Ephesians 3:13; as to well doing, 2 Thessalonians 3:13 , "be not weary" (AV marg., "faint not"). Some mss. have this word in Galatians 6:9 (No. 1).

3: κάμνω

(Strong's #2577 — Verb — kamno — kam'-no )

primarily signified "to work;" then, as the effect of continued labor, "to be weary;" it is used in Hebrews 12:3 , of becoming "weary" (see also No. 1), RV, "wax not weary;" in James 5:15 , of sickness; some mss. have it in Revelation 2:3 , AV, "hast (not) fainted," RV, "grown weary." See SICK , WEARY.

Note: For apopsucho, Luke 21:26 , RV, see FAIL , Note (3).

Bibliography Information
Vines, W. E., M. A. Entry for 'Faint'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/f/faint.html. 1940.

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Vine's Expository Dictionary of NT Words

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Faint