אׇמְנָהʼomnâh

verily, truly, indeed (Genesis 20:12; Joshua 7:20)

Pronunciation: om-naw' · Hebrew/Aramaic (Old Testament) · H546

Same root

אֹמֶןʼômen · H544verity

Where it appears

Appears 2 times in the Bible.

Genesis 20:12 And she really is my sister, for we both have the same father, but different mothers. And I married her.
Joshua 7:20 Achan replied, “It is true! I have sinned against the Lord, the God of Israel.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).