Strong’s Greek
G5049 — teleios
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
τελείως
teleios — pronounced tel-i'-oce
adverb from 5046; completely, i.e. (of hope) without wavering:--to the end. see GREEK for 5046
1 occurrence in the KJV.
1 Peter 1:13
Wherefore gird up the loins of your mind, be sober, and hope to the end for the grace that is to be brought unto you at the revelation of Jesus Christ;