Kalmar “Ametabolic” sifa ce da ke nufin kwayar halittar da ba ta shiga cikin metamorphosis, wanda tsari ne na sauye-sauye na zahiri a yayin ci gaba. A wasu kalmomi, kwayar halitta ametabolic ba ta yin canje-canje masu mahimmanci a cikin tsari da tsarinta yayin da yake girma daga matashi zuwa girma. Ana amfani da wannan kalmar a fannin ilmin halitta, musamman wajen nazarin kwari, don bayyana waɗanda ba su da madaidaicin yanayin rayuwa.