supercilious

supercilious [suːpəsɪlɪəs]
ADJ. arrogant; haughty; snobbish
ADV. -ly
NOUN -ness

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useful resources:

http://www.oxforddictionaries.com/
http://dictionary.cambridge.org/
http://www.wordreference.com/
http://www.merriam-webster.com/