What does 非～ mean?
非～ is a Japanese noun meaning “anti~, counter~, an~, non~” in English. It is written as 非～ in kanji, ひ～ in hiragana, and hi～ in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
「キャッチボールしようか」「よし、是非やろう」
"How about playing catch?" "Sure, why not?"