"eccentric" in the noun sense
1. eccentric, eccentric person, flake, oddball, geek
a person with an unusual or odd personality
2. character, eccentric, type, case
a person of a specified kind (usually with many eccentricities
"a real character"
"a strange character"
"a friendly eccentric"
"the capable type"
"a mental case"
"eccentric" in the adjective sense
1. bizarre, eccentric, freakish, freaky, flaky, flakey, gonzo, off-the-wall, outlandish, outre
conspicuously or grossly unconventional or unusual
"restaurants of bizarre design
2. eccentric, nonconcentric
not having a common center not concentric
"eccentric circles"
Source: WordNet® (An amazing lexical database of English)
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