Maybe you're looking for the term "stereotyped". This means assuming everyone who is in a certain class, race or status have the same characteristics. For example here is one that is a false label or stereotype - "All black men are criminals." Not true! That would be a false label or stereotype. Shame on folks who do this! :-)
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False leg or a False Foot
You are thinking of the term Dutch Courage.
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Pseudesthesia is the medical term meaning false sensation.
A beta error is another term for a type II error, an instance of accepting the null hypothesis when the null hypothesis is false.
False is my answer. The term originated years after Adams died.
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A false limb is a prosthetic limb.
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The term 'false feet' is the plural form; the singular form is 'false foot'.
Another term for pseudopods is "false feet." These temporary projections of a cell's surface are primarily used for movement and feeding in organisms such as amoebas. Pseudopods allow these organisms to engulf food particles or move through their environment by extending and retracting these extensions.