The phrase "false at best" is correct and usable in written English.
You can use this phrase when something is incorrectly stated or is not necessarily true. For example, "He said he was an expert in economics, but that is false at best."
Analogical arguments are identified as a false basis for generalizations; they are "at best only admissible as an inconclusive presumption, where real proof is unattainable" (Bk. V, v, 6).
Pocketing that charge, no matter how legal or "transparent", feels like false advertising at best, and daylight robbery at worst.
His has always been an acutely self-conscious sensibility, that of a man in love with the traditions of musicals but aware that those traditions can't always accommodate a modern world in which cherished institutions seem false or at best unreliable.
More generally, Orzack concludes (p. 87): [E]volutionary biologists often use models having assumptions known to be manifestly false or at best of uncertain validity in order to predict evolutionary outcomes.
Thus, false-negative results on PET are also false negative or at best equivocal on CT and MRI.
Given that predator-elicited and deceptive false alarms showed, at best, minimal structural differences, it is somewhat surprising that playbacks of false alarms tended to be more likely to elicit escape reactions than were predator-elicited alarms, the opposite trend relative to what was expected when the eliciting context can be differentiated based on acoustic features.
But most of all, it was a classic Trump speech because it contained a cornucopia of muddled and unsupported claims — some flat-out false, many questionable at best.
Gibbon's claim that "all religions … are false to philosophers" is, at best, a gross exaggeration.
Stereotypes, particularly, are an immediate bête noire: the overused trope of the eager house mom and the tired working father ring false and feel outdated at best and at worst are offensive to a generation of ambitious, working women and fathers willingly assuming domestic roles.
