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Jyutping fu2 si1
Pinyin kǔ sī

Definitions (CC-CEDICT)
  1. to think hard
  2. bitter thoughts
  3. to pour out one's sufferings
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. verb
    to think hard; to cudgel one's brains
    (syn.) 考虑, 顾全, 琢磨, 深思, 掂量, 思虑, 計較, 著想, 尋味, 寻思, 沉思, 思想, 尋思, 计算, 斟酌, 思索, 照顾, 思维, 照顧, 算计, 玩味, 慎思, 品味, 寻味, 思維, 考慮, 思慮, 冥思, 思量, 設想, 顧及, 計算, 着想, 顧全, 算計, 顾及, 思, 掂掇, 计较, 设想, 念, 揣摩, 冥想, 思考, 推敲, 玩弄, 思裁
Examples (Wiktionary)
  1. Mandarin
    苦思冥想
    苦思冥想
    kǔ sī míng xiǎng
    • to think long and hard