Answer:

inmost

AnswerCrossword Clue
INMOSTNearest the center
INMOSTDeepest, as feelings
INMOSTExtremely personal
INMOSTSecret to the max
INMOSTLike the hub, relatively
INMOSTClosest to the center
INMOSTDeepest
INMOSTLike deep recesses
INMOSTNearest the heart
INMOSTNearest the middle
INMOSTDeepest within.
INMOSTDeepest.
INMOSTFarthest from the surface.
INMOSTFarthest from the surface
INMOSTDeepest, as thoughts
INMOSTDeeply personal
INMOSTHardest to get at
INMOSTCentral
INMOSTDeepest, as thoughts or feelings
INMOSTAt the very center
INMOSTSituated farthest from the edges
INMOSTLike Mercury among all the planets