1) At the very center 2) Central 3) Closest to the center 4) Deepest 5) Deeply personal 6) Extremely personal 7) Farthest from the surface 8) Farthest within 9) Hardest to get at 10) Innermost 11) Intimate 12) Inward 13) Like the hub, relatively 14) Nearest the center 15) Nearest the heart 16) Nearest the middle Found on https://www.crosswordclues.com/clue/inmost
In'most` adjective [ Middle English innemest , Anglo-Saxon innemest , a double superlative form from inne within, from in in. The modern form is due to confusion with most . See In , and confer Aftermost , Foremost , Innermost .] Deepes... Found on http://www.encyclo.co.uk/webster/I/63