Strong’s Greek
G35 — agenealogetos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀγενεαλόγητος
agenealogetos — pronounced ag-en-eh-al-og'-ay-tos
from 1 (as negative particle) and 1075; unregistered as to birth:--without descent. see GREEK for 1 see GREEK for 1075
1 occurrence in the KJV.
Hebrews 7:3
Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.