The story
- Old English · inherited frominnemest“innermost”
- Middle English · inherited frominnermost
- English todayinnermost
From Middle English innermost, innermest, in-nermast, alteration (due to Middle English inner, innere (“inner”)) of Old English innemest (“innermost”), equivalent to inner + -most.
Words from the same roots
Etymology from Wiktionary, CC BY-SA 4.0.