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Jyutping cau4 ging6
Pinyin qiú jìng

Definitions (CC-CANTO)
  1. (of strokes in calligraphy or painting) vigorous and powerful
Definitions (Wiktionary)
  1. adj, literary
    powerful; vigorous
    (syn.) 剛勁, 刚健, 剛健, 刚劲