reliable person; person of firm character; gutsy person
Describes someone who is dependable, steady, and has a strong, reliable personality. Often used as a compliment.
She is a reliable person who handles both work and housework properly.
That child is so young but has such a firm character, isn't it?
Rare kanji spelling using 確り for しっかり; not commonly used.
Compound of しっかり (firmly, steadily) and 者 (person). The exact origin of しっかり is uncertain, but it is a native Japanese mimetic/adverbial word.