IPA: //nɒnˌɪnˈflɛkʃənl//
KK: /nɑnɪnˈflɛkʃənl/
This word describes something that does not change form to express different grammatical features, such as tense or number.
In linguistics, a noninflectional word remains the same regardless of its grammatical role.
Noninflectional → It is formed from "non-" (meaning not) and "inflection" (from Latin "inflectere", meaning to bend or change). The word describes a grammatical form that does not change or bend in its structure, indicating a lack of inflection.
Think of 'non-' meaning 'not' and 'inflection' referring to a change in form — so noninflectional means something that does not change its form.