but, certainly, nevertheless, surely, truly, verily

Strong’s Dictionary of Hebrew Words:

Number:
403 (find all occurrences in KJV Bible)
Transliteration:
’aken
Phonic:
aw-kane’
Meaning:
from 3559 (compare 3651); firmly; figuratively, surely; also (advers.) but
KJV Usage:
but, certainly, nevertheless, surely, truly, verily