polymorphous
US /ˌpɑː.lɪˈmɔːr.fəs/
UK /ˌpɑː.lɪˈmɔːr.fəs/
1.
occurring in several different forms, especially with reference to species or to individual organisms at different stages of the life cycle.
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The virus is polymorphous, making it difficult to develop a single vaccine.
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The artist's work is polymorphous, constantly evolving in style and medium.