Inflectable is an adjective that describes a word that can be inflected, which means it can take different forms by adding certain suffixes, prefixes, or endings to indicate tense, case, gender, number, or other grammatical categories. The opposite of inflectable is uninflectable or uninflected, which refers to a word that does not change its form no matter what context it is used in. Such words include prepositions, conjunctions, articles, and many pronouns. Another antonym for inflectable is fixed, which suggests that a word has a constant form and cannot be modified or adapted to suit different grammatical or semantic demands. Other related antonyms may include unchangeable, rigid, unalterable, or static.