na-adjective, noun
Describes a strong, heartfelt desire or request. Often used in the adverbial form 切に or the attributive 切なる. The glosses 'kind' and 'acute' are less common and context-dependent.
彼の切なる願いがついに叶った。
His earnest wish finally came true.
切にお詫び申し上げます。
I sincerely apologize.
interjection
OFF (on a switch)
Abbreviation of 切る (to turn off). Used as an interjection or label on switches, often in the form きり as well. Not used in formal writing.
See also: 切る
スイッチを切にしてください。
Please turn the switch OFF.
このボタンは「切」と書いてある。
This button says 'OFF'.
The kanji 切 originally means 'cut'. The 'eager' sense likely developed from the idea of cutting deeply into one's heart, while the 'OFF' sense is an abbreviation of 切る (to cut off).