Nouns may either be inflectable or non-inflectable.

German adverbs form a group of not inflectable words (except for comparison in which in rare cases some are inflected like adjectives, too).

A basic verb complex in Marra consists of a pronominal prefix, an inflectable verb-stem, and suffixes marking tense, aspect, and mood.

Often, however, there is an uninflectable "main verb" that specifies the meaning of the verb that is then followed by the inflectable "auxiliary verb."

In some constructions, there is a "main verb," which presents the basic idea, and then an inflectable "auxiliary verb" which refines the meaning of the main verb.

In the strict sense of the term "uninflected", only invariable words are uninflected, but in broader linguistic usage, these terms are extended to be inflectable words that appear in their basic form.