"farfetched" in the adjective sense
1. farfetched, far-fetched
of an idea or story) so exaggerated or ludicrous as to be improbable
"He was always full of far-fetched plans, none of which ever worked"
2. farfetched, far-fetched
of a theory or explanation) highly imaginative but unlikely and unconvincing
"a farfetched excuse"
Source: WordNet® (An amazing lexical database of English)
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