ec·cen·tric
ikˈsentrik/
adjective
adjective: eccentric

1.
(of a person or their behavior) unconventional and slightly strange.
"my favorite aunt is very eccentric"
synonyms: unconventional, uncommon, abnormal, irregular, aberrant, anomalous, odd, queer, strange, peculiar, weird, bizarre, outlandish, freakish, extraordinary; More
idiosyncratic, quirky, nonconformist, outré;
informalway out, offbeat, freaky, oddball, wacky, kooky
"eccentric behavior"
antonyms: conventional
2.
technical
(of a thing) not placed centrally or not having its axis or other part placed centrally.
(of a circle) not centered on the same point as another.
(of an orbit) not circular.

noun
noun: eccentric; plural noun: eccentrics

1.
a person of unconventional and slightly strange views or behavior.
"he enjoys a colorful reputation as an engaging eccentric"
synonyms: oddity, odd fellow, character, individualist, individual, free spirit