implausible

adjectives

having a quality that provokes disbelief
"gave the teacher an implausible excuse"
implausible
is derived from
implausibleness
is derived from
implausibility
antonym
plausible
is similar to
having a probability too low to inspire belief
improbable, unbelievable, unconvincing, unlikely
see also
beyond belief or understanding
"at incredible speed"; "the book's plot is simply incredible"
incredible, unbelievable
highly imaginative but unlikely
"a farfetched excuse"; "an implausible explanation"
farfetched, implausible
is derived from
implausibleness
is derived from
implausibility