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Synonyms for Intimate (same or very similar meaning)

WordNet sense 1 (someone to whom private matters are confided):
confidant

WordNet sense 2 (innermost or essential):
inner, internal

WordNet sense 3 (belonging to a thing by its very nature):
intrinsic

WordNet sense 4 (having or fostering a warm or friendly and informal atmosphere):
cozy, informal

WordNet sense 5 (characteristic of or befitting a friend):
friendly

WordNet sense 6 (thoroughly acquainted through study or experience):
knowledgeable, versed

WordNet sense 7 (having experience; having knowledge or skill from observation or participation):
experienced, experient

WordNet sense 8 (imply as a possibility):
suggest

WordNet sense 9 (give to understand):
adumbrate, insinuate

WordNet sense 10 (having mutual interests or affections; of established friendship):
familiar

WordNet sense 11 (close in relevance or relationship):
close


From the ODE community, based on WordNetadd/edit