noun
infinitive mood
A grammatical term referring to the infinitive form of a verb. Used primarily in linguistic or language-learning contexts.
英語の不定法は「to + 動詞の原形」で表される。
The English infinitive is expressed as 'to + base form of the verb'.
Compound of 不定 (indefinite) and 法 (mood/method), likely a calque from Western grammatical terminology.