Part of speech:
Open to question or doubt:
Something that will last for only a limited period of time; transitory. Temporary is meaningless with regard to the duration of the length of time that it will last; however, it is used to designate absence of permanence.
Marked by or exhibiting a lack of reliability.
That can or should be questioned or doubted; open to doubt
Of dubious character, morality, or legality; questionable:
Precarious; unstable; unreliable.
An ephemeral thing; specif., an organism with a brief life cycle
Tending to pass away or fade from sight like mist or smoke; ephemeral
Short-lived or ephemeral, as a life.
The definition of reliable is dependable or capable of being trusted.
The definition of reputable is someone or something that is considered good or reliable.
The definition of trustworthy is someone who is honest who can be entrusted with your secrets or with anything else of importance.
Find another word for fly-by-night. In this page you can discover 25 synonyms, antonyms, idiomatic expressions, and related words for fly-by-night, like: undependable, untrustworthy, transient, shaky, temporary, unreliable, brief, questionable, shady, unscrupulous and unsure.