From ya'aph; fatigued; figuratively, exhausted -- faint, weary.
see HEBREW ya'aph
H3287. yaeph
יָעֵף adjective weary, faint; — always as substantive, except Judges 8:15 הַיְּפֵעִים אנשׁיך (of physical fatigue from lack of bread); הַיָּעֵף 2 Samuel 16:2 (from lack of drink); of mind and spirit Isaiah 40:29 ("" אוֺנִין אֵין), 50:4.