A person who pretends to be something they are not, especially to impress others. Alternatively, a difficult question or problem.
From Middle English posen 'to place, put', from Old French poser. The meaning 'one who poses' emerged in the 16th century, while the derogatory sense of 'pretentious person' developed in the 20th century.
The dual meaning of poser reflects how language evolves - originally neutral (one who poses questions), it gained a negative connotation as society became more aware of performative behavior. The word captures our instinctive dislike of inauthenticity.
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