heteroclite

adjective Also het·er·o·clit·ic [het-er-uh–klit-ik] /ˌhɛt ər əˈklɪt ɪk/, het·er·o·clit·i·cal.

1. irregular or abnormal; anomalous.
2. Grammar. irregular in inflection; having inflected forms belonging to more than one class of stems.

noun

3. a person or thing that deviates from the ordinary rule or form.
4. Grammar. a heteroclite word.

adjective Also: heteroclitic (ˌhɛtərəˈklɪtɪk)

1. (esp of the form of a word) irregular or unusual

noun

2. an irregularly formed word