1.
kind, friendly, helpful
Showing care and consideration for others. Describes a person or their behavior as warm and helpful.
親切 is a na-adjective: 親切な (before nouns), 親切だ/です (predicate), 親切じゃない (negative). The kanji literally mean 'close + cut' - the idea of being close enough to someone to help them. Can also be used as a noun: 親切 (kindness).
Related: 不親切 (unkind).