Suffix, I-adjective (keiyoushi)
cannot completely ... (because it is excessive)
Usually written using kana aloneafter the -masu stem of a verbsee 切れる
そうやって俺のことを気にしつつ、しかし素直になりきれない、そのツンデレさが今若い男の間で大ブーム!That way you keep thinking about me but are unable to admit to your feelings, that hot and cold feel is a real boom among young men!
Also written 切れ無い【きれない】