inmost

alternative innermost

1. superlativesuperlative form of inner: most inner; the very deepest within; farthest from the surface or external part.

   It was as though she were attempting to read my inmost soul, […]

   1913 January–May, Edgar Rice Burroughs, “The Gods of Mars”, in The All-Story, New York, N.Y.: Frank A. Munsey Co., →OCLC; republished as “A Fair Goddess”, in The Gods of Mars, Chicago, Ill.: A[lexander] C[aldwell] McClurg & Co., September 1918, →OCLC, page 104

   2 more examples

   Courtenaye was at once carried out of himself; he caught the fire of the actor; the splendid voice, the noble gesture, and the exalted sentiment, aided by the pomp of the verse, mastered his inmost soul.

   1837, L[etitia] E[lizabeth] L[andon], “A First Night”, in Ethel Churchill: Or, The Two Brides. […], volume II, London: Henry Colburn, […], →OCLC, page 68

   Virginia Carteret was finding it a new and singular experience to have a man tell her baldly at their first meeting that he had read her inmost thought of him.

   1905, Francis Lynde, A Fool for Love, The Bobbs-Merrill Company, Indianapolis, page 25

plural inmosts · alternative innermost

1. That which is inmost; the core.