noun
non-finite verb
Linguistics term for verb forms that are not marked for tense, person, or number, such as infinitives, participles, and gerunds.
英語の不定詞や動名詞は非定形動詞の例です。
English infinitives and gerunds are examples of non-finite verbs.
定形動詞 (finite verb) is the opposite: a verb form that is marked for tense, person, or number.
Compound of 非 (non-) + 定形 (fixed form) + 動詞 (verb), a calque from English 'non-finite verb'.