Inward

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Old English inweard, inneweard, innanweard (see in, -ward).

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From Middle English inward, from Old English inweard, corresponding to in +‎ -ward.

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inward (adj.)

Old English inweard "inmost; sincere; internal, intrinsic; deep," from Proto-Germanic *inwarth "inward" (source also of Old Norse innanverðr, Old High German inwart, Middle Dutch inwaert), from root of Old English inne "in" (see in (adv.)) + -weard (see -ward). As an adverb, Old English inneweard. As a noun in late Old English, "entrails, intestines."