non-finite verb
Linguistics term for verb forms that are not marked for tense, person, or number, such as infinitives, participles, and gerunds.
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'.