certainly, clean, indeed, of a truth, verily

Strong’s Dictionary of Greek Words:

Number:
3689 (find all occurrences in KJV Bible)
Greek:
ὄντως
Transliteration:
ontos
Phonic:
on’-toce
Meaning:
adverb of the oblique cases of 5607; really
KJV Usage:
certainly, clean, indeed, of a truth, verily