heteroclite

adj

1. Irregularly declined or inflected.
2. (dated)Deviating from the ordinary rule; eccentric, abnormal.

   “he was, on the contrary, as mercurial and sublimated a composition, […] as heteroclite a creature in all his declensions; […] with as much life and whim, and gaité de cœur about him, as the kindliest climate could have engendered and put together.”

   “Nor could I have dreamed the heteroclite crew-men I had met aboard Tzadkiel's ship […]”

noun

1. An irregularly declined or inflected word.
2. A word whose etymological roots come from distinct, different languages or language groups.
3. A person who is unconventional; a maverick.