English

insooth

From in + sooth.

A compound of in + sooth

Proto-Indo-European *h₁én ‘in’

Proto-Germanic *in

Proto-West Germanic *in

Old English in

Middle English in ‘inside’

English in

Proto-Indo-European *h₁es- ‘to be’

…

Proto-Germanic *sanþaz ‘truth’

Proto-West Germanic *sanþ ‘true’

Old English sōþ ‘truth’

Middle English sooth

English sooth

Today it means

adv truly

Language periods are conventional ranges, not dates for this word.