Part of speech: Adjective (satellite)
situated or occurring farthest within
Example: the innermost chamber
Part of speech: Adjective (satellite)
being deepest within the self
Example: one's innermost feelings
The word "innermost" comes from Old English innemest, which comes from Middle English innermost. Many other languages have similar words:
inner – A related word in the same word family.
most – A related word in the same word family.
The Anglo-Saxons brought Germanic vocabulary to Britain in the 5th century CE.