fly-by-night

Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

a debtor who flees to avoid paying
• Hypernyms:
debtor, debitor

II - adjective

1. (of businesses and businessmen) unscrupulous
- a shady operation
• Syn:
shady
• Similar to:
untrustworthy, untrusty
• Derivationally related forms:
shadiness (for: shady)
2. ephemeral
- the symphony is no fly-by-night venture
• Similar to:
impermanent, temporary