This is the 7943rd most frequent Japanese word.
変っ
"変っ" is an informal or incomplete form of "変," meaning "strange" or "unusual" in English.
In this context, '変っ' again contributes to the verb '変わる', focusing on the surprising alteration of someone's opinion.
彼の意見が突然変って驚いた。
I was surprised because his opinion suddenly changed.
Here, '変' is used as an adjective '変な', meaning 'strange' or 'odd', describing unusual behavior.
彼の行動が変でした。
His behavior was strange.
In this sentence, '変っ' functions as part of the verb '変わる', meaning 'to change', indicating a shift in conditions like the weather.