a. Unwilling to tolerate differences in opinions, practices, or beliefs, especially religious beliefs.

b. Opposed to the inclusion or participation of those different from oneself, especially those of a different racial, ethnic, or social background.

c. Unable or unwilling to endure or support: intolerant of interruptions; a community intolerant of crime.

d. Unable to digest or metabolize a food, drug, or other substance or compound: people who are lactose intolerant.