not to be trusted (adjective) fly-by-night: unreliable and shady
Sinonime: R and D,
analysis,
assay,
attempt, audition,
check,
crack*, dry run,
effort,
endeavor,
essay,
examination,
experience,
experiment, experimentation,
fling*,
go*,
hassle*,
investigation,
lick*, probation,
proof, research and development, shakedown,
shot*, showcase,
stab*,
striving,
struggle, test run, testing, trial and error, trial run,
try, try on, tryout,
undertaking,
venture, whack, workout
Antonime: dependable,
reliable,
reputable,
responsible,
trustworthy