When considering the phrase "not proportionate," there are a number of synonyms that may be used to convey similar meaning or intent. Some possible synonyms for "not proportionate" might include "imbalanced," "disproportional," "uneven," "unbalanced," or "disproportionate." Other possible alternatives could include "not commensurate," "disparate," "unequal," or "incommensurate." Depending on the context and intended effect, different synonyms may be more appropriate or effective than others. However, all of these alternatives can help to convey the idea that something is not in proper balance or is out of proportion with other factors or considerations.