無影無跡 [无－无迹]

Jyutping mou4 jing2 mou4 zik1
Pinyin wú yǐng wú jì

Definitions (Wiktionary)
  1. phrase, Hokkien, Teochew, idiomatic
    baseless
    (syn.) 子虚乌有, 子虛烏有
  2. phrase, Teochew, idiomatic
    impossible
  3. phrase, Hakka, idiomatic
    to disappear without a trace
  4. phrase, Hakka, Teochew, idiomatic
    to fabricate something out of thin air
    (syn.) 无中生有, 無中生有