飄忽不定

飘忽不定
piāodìng
  1. to drift without a resting place (idiom)
  2. roving
  3. errant
  4. vagrant
  5. erratic

CEDICT

to be unsteady in motion; to drift from place to place; to be erratic

Wiktionary

形容出沒不定

重編國語辭典

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