Strong’s Hebrew
H553 — 'amats
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
אָמַץ
'amats — pronounced aw-mats
a primitive root; to be alert, physically (on foot) or mentally (in courage):--confirm, be courageous (of good courage, stedfastly minded, strong, stronger), establish, fortify, harden, increase, prevail, strengthen (self), make strong (obstinate, speed).
0 occurrences in the KJV.