inwardness
Word family
Synonym discussion
Sense: noun/1
'Inwardness' suggests a person's attention turning toward a private emotional or spiritual life, often with some distance from the outer world. 'Introspection' is narrower: it means examining your own thoughts on purpose, almost like self-analysis. 'Reserve' focuses more on outward restraint; a reserved person may hide feelings without having much inner depth. 'Spirituality' overlaps when the inward focus is religious or moral, but it misses the broader emotional meaning. 'Interiority' is the closest academic cousin, especially in literary criticism, though it sounds more technical. You might praise a novel for its inwardness, describe therapy as encouraging introspection, and call a quiet colleague reserved rather than deeply inward.
Etymology
Built in English from the adjective 'inward' and the noun-forming suffix '-ness'. 'Inward' goes back to Old English forms meaning 'toward the inside', and '-ness' turns a quality into an abstract noun. So the word first meant the state of being inward, then widened to describe a person's private inner life and the inner character of a thing.