Synonyms for Hemimetabolous (same or very similar meaning)
WordNet sense 1 ((of an insect with aquatic young) undergoing incomplete metamorphosis in which the young does not resemble the adult):
hemimetabolic, hemimetamorphic, hemimetamorphousWordNet sense 2 (characterized by metamorphosis or change in physical form or substance):
metamorphicFrom the ODE community, based on WordNetadd/edit