inmost
‘most inward’
Lexical development traced from the Tamil root:
E. innemyst, in-mast, in(n)emaste, ynmost < M.E. innemest < O.E. innemest ‘furthest within, remotest from the boundary’ < in ‘in, into, upon, on, at, among; about, during’ < inne ‘within, inside’ < Proto-G. in + -most < in < en < Tamil il-iṉ