Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun fly-by-night

1 sense of fly-by-night

Sense 1
fly-by-night -- (a debtor who flees to avoid paying)
       => debtor, debitor -- (a person who owes a creditor; someone who has the obligation of paying a debt)

Antonyms of adj fly-by-night

2 senses of fly-by-night

Sense 1
fly-by-night, shady -- ((of businesses and businessmen) unscrupulous; "a shady operation")

INDIRECT (VIA untrustworthy) -> trustworthy, trusty -- (worthy of trust or belief; "a trustworthy report"; "an experienced and trustworthy traveling companion")

Sense 2
fly-by-night -- (ephemeral; "the symphony is no fly-by-night venture")

INDIRECT (VIA impermanent) -> permanent, lasting -- (continuing or enduring without marked change in status or condition or place; "permanent secretary to the president"; "permanent address"; "literature of permanent value")

Similarity of adj fly-by-night

2 senses of fly-by-night

Sense 1
fly-by-night, shady -- ((of businesses and businessmen) unscrupulous; "a shady operation")
       => untrustworthy (vs. trustworthy), untrusty -- (not worthy of trust or belief; "an untrustworthy person")

Sense 2
fly-by-night -- (ephemeral; "the symphony is no fly-by-night venture")
       => impermanent (vs. permanent), temporary -- (not permanent; not lasting; "politics is an impermanent factor of life"- James Thurber; "impermanent palm cottages"; "a temperary arrangement"; "temporary housing")