快 (pinyin kuài, "soon, fast") is an HSK 2 Mandarin character with 7 strokes, built on the radical 忄.
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快
Newkuài
soon, fast
Tone 4 · Fourth tone (falling)
Radical
忄
Strokes
7
HSK
2 · tier 2a
Radical family
Other characters built on the same radical 忄. Often shares meaning category.
Pinyin neighbors
Characters with the same rime -uai, same-tone matches first. Many are true phonetic relatives; others are coincidental.