disproportionate

US /ˌdɪs.prəˈpɔːr.ʃən.ət/
UK /ˌdɪs.prəˈpɔːr.ʃən.ət/
1.

too large or too small in comparison to something else, or not deserving its importance or influence:

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There are a disproportionate number of girls in the class.