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Jyutping fei1 fei1
Pinyin fēi fēi

Definitions (Wiktionary)
  1. verb, literary
    to not accept as correct; to think nothing of
  2. verb, literary
    to be in fact not incorrect; to be actually not wrong
  3. verb, literary
    to negate something that ought to be negated; to censure a fault
  4. noun, figuratively, literary
    wishful thinking; fantasy
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    千万别想入非非。
    千萬別想入非非。
    qiān wàn bié xiǎng rù fēi fēi 。
    • Be careful not to let your imagination run away with you.
Examples (粵典–words.hk)
  1. Cantonese
    派咁多警察对付啲和理非非嘅示威者,真系好多余。
    派咁多警察對付啲和理非非嘅示威者,真係好多餘。
    paai3 gam3 do1 ging2 caat3 deoi3 fu6 di1 wo4 lei5 fei1 fei1 ge3 si6 wai1 ze2, zan1 hai6 hou2 do1 jyu4.
    • It is beyond superfluous to send so many police officers to deal with some demonstrators who are "peaceful, rational, non-violent and foul-language free".
  2. Cantonese
    呢啲是是非非我冇耳听啊。
    呢啲是是非非我冇耳聽啊。
    ni1 di1 si6 si6 fei1 fei1 ngo5 mou5 ji5 teng1 aa1
    • I don't want to hear this gossip