perfectionist

One who believes in any form of perfectionism.

Specifically [capitalized] A member of the Oneida Community. See community. Also called Bible Communist.

One pretending to perfection; esp., one pretending to moral perfection; one who believes that persons may and do attain to moral perfection and sinlessness in this life.

One who has a propensity for being displeased with anything that is not perfect or does not meet extremely high standards.

a person who is displeased by anything that does not meet very high standards