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arch

adjective
 
 
/ɑːtʃ/ US  /ɑːrtʃ/

Definition

showing that you think it is funny that you know more about something than someone else does: an arch tone of voiceAffected and insincere archly
 
 
/ˈɑːtʃli/ US  /ˈɑːrtʃli/ adverb
She smiled archly at him. "I fail to understand what you're suggesting," said Claire archly.Affected and insincere
(Definition of arch adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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