arrogant, big-headed (informal) conceited, condescending, haughty, high and mighty (informal) hoity-toity (informal) patronizing, proud, snobbish, snooty (informal) swollen-headed, toffee-nosed (slang, chiefly Brit.) uppish (Brit. informal) uppity (informal)
English Collins Dictionary - English synonyms & Thesaurus
If you say that someone is stuck-up, you mean that are very proud and unfriendly because they think they are very important.
She was a famous actress, but she wasn't a bit stuck-up.
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