matawhawhati
1. (stative) be sudden, unexpected, out of the blue, unpredictable.
He wahine tino panapana, tino hūkokikoki, ā, he wā anō, he matawhawhati te whanonga (TTR 1996:56). / She was a very emotional and temperamental woman and sometimes behaved unpredictably.
Synonyms: whāia (nei) ka/kua