fly-by-night

Noun
  1. A debtor who flees to avoid paying (synset 110118157)
Adjective
  1. (of businesses and businessmen) untrustworthy or undependable (synset 302475791)
    "a fly-by-night operation"
  2. Ephemeral (synset 301761594)
    "the symphony is no fly-by-night venture"

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