Dilettante implies superficial knowledge, often lacking depth or real expertise. He's a dilettante when it comes to gardening, only planting the easy stuff.
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Negative Connotation
Often used negatively to suggest lack of dedication or seriousness. Her dilettante attitude in rehearsals frustrated the director.
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Hobbyist Implication
Can imply that someone is a hobbyist rather than a professional. Despite being a dilettante in music, he enjoys playing the piano.