Falsest meaning : Untrue, not factual, factually incorrect. Based on factually incorrect premises. Spurious, artificial. Of a state in Boolean logic that indicates a negative result. Uttering falsehood; dishonest or deceitful. Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous. Not well founded; not firm or trustworthy; erroneous. Not essential or permanent, as parts of a structure which are temporary or supplemental. Used in the vernacular name of a species (or group of species) together with the name of another species to which it is similar in appearance. Out of tune.