Strong's Greek Dictionary
ἐγκακέω (ekkakeo)
from 1537 and 2556; to be (bad or) weak, i.e. (by implication) to fail (in heart)
from 1537 and 2556; to be (bad or) weak, i.e. (by implication) to fail (in heart):--faint, be weary. see GREEK for 1537 see GREEK for 2556
James Strong, Strong's Greek Dictionary (1890) — public domain