idiopathic

constitutional dominant elementary essential fundamental immediate initial leading main prime principal underlying vital

central chief first primitive simple

direct earliest primal

advanced auxiliary extra inessential inferior last minor nonessential secondary subordinate trivial unimportant

sophisticated

casual impromptu instinctive offhand simple unplanned voluntary

ad-lib automatic break loose down extemporaneous extempore free free-spirited from the hip impetuous improvised inevitable involuntary irresistible natural off top of head off-the-cuff unartful unavoidable unbidden uncompelled unconscious unconstrained uncontrived uncontrolled unforced unintentional unpremediated unprompted unsophisticated unstudied up front

deliberate planned

intended premeditated

anonymous exotic foreign nameless new remote strange uncharted undiscovered unexplained unexplored unfamiliar unidentified unnamed unrecognized

X alien dark far secret

concealed desolate distant far-off faraway hidden humble incog incognito little-known such and such unapprehended unascertained uncelebrated undistinguished unheard-of unnoted unperceived unrenowned unrevealed unsung untold

common familiar identified known named native normal regular relevant usual

characteristic distinctive individual peculiar singular specific unique

quirky

personal

lone original particular personal respective separate single singular sole special specific

characteristic diacritic express solitary

alone definite diagnostic different discrete distinct especial idiosyncratic indivisible odd only own peculiar personalized proper reserved secluded select several uncommon unique unitary unusual

combined common general indefinite mixed normal ordinary together unimportant united usual