- kernel, substance, core, center, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty - the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
--1 is a kind of content, cognitive content, mental object
--1 has particulars:bare bones; hypostasis; quiddity, haecceity; quintessence; stuff - inwardness - preoccupation especially with one's attitudes and ethical or ideological values; "the sensitiveness of James's characters, their seeming inwardness"; "Socrates' inwardness, integrity, and inquisitiveness"
--2 is a kind of cognitive state, state of mind
Antonyms: outwardness
- inwardness - the quality or state of being inward or internal; "the inwardness of the body's organs"
--3 is a kind of position, spatial relation
Antonyms: outwardness, externality
- inwardness - preoccupation with what concerns human inner nature (especially ethical or ideological values); "Socrates' inwardness, integrity, and inquisitiveness"- H.R.Finch
--4 is a kind of introversion
Antonyms: outwardness
--4 has particulars: spirituality, spiritualism, otherworldliness