When you're intolerant, you can't or won't put up with something. Usually, that means you're not very open-minded.

Being intolerant can mean you have a medical condition, like lactose intolerant people who can't eat dairy products. But more often being intolerant means you're unwilling to tolerate other ideas, opinions, beliefs or cultures. Homophobic people are intolerant of gay people. Sexist people are intolerant of women. Racist people are intolerant of people from other races. So it's safe to say intolerant people aren't the friendliest folks.

Definitions of intolerant
  1. adjective
    unwilling to tolerate difference of opinion
    lacking love and generosity
    blindly and obstinately attached to some creed or opinion and intolerant toward others
    rigid, strict
    incapable of compromise or flexibility
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    showing respect for the rights or opinions or practices of others
    full of love and generosity
    enduring trying circumstances with even temper or characterized by such endurance
    not opinionated
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  2. adjective
    narrow-minded about cherished opinions
    synonyms: illiberal
    blinkered, narrow, narrow-minded
    lacking tolerance or flexibility or breadth of view
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