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Jyutping sik1 dak1 kei4 faan2
Pinyin shì dé qí fǎn

Definitions (CC-CEDICT)
  1. to produce the opposite of the desired result
Definitions (粵典–words.hk)
  1. 語句
    結果​同​本意​、​期望​相反
    to be just the opposite of what one wished
    • 健身過量可能會適得其反。
      健身过量可能会适得其反。
      gin6 san1 gwo3 dou6 ho2 nang4 wui5 sik1 dak1 kei4 faan2.
      To overdo it in the gym may result in the opposite of what you wish.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to run counter to one's desire; to have the exact opposite effect of what one wished; to backfire
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    ...不然难免会有适得其反的情况出现。
    ...不然難免會有適得其反的情況出現。
    ... bù rán nán miǎn huì yǒu shì dé qí fǎn de qíng kuàng chū xiàn 。
    • ... Otherwise it is (or will be) hard to avoid a counterproductive situation.
Examples (粵典–words.hk)
  1. Cantonese
    健身过量可能会适得其反。
    健身過量可能會適得其反。
    gin6 san1 gwo3 dou6 ho2 nang4 wui5 sik1 dak1 kei4 faan2.
    • To overdo it in the gym may result in the opposite of what you wish.