noun
free verse
A poetic form that does not follow fixed patterns of meter, rhyme, or line length. Used in literary contexts.
彼は伝統的な定型詩ではなく、不定型詩を好んで書いた。
He preferred writing free verse rather than traditional fixed-form poetry.
定型詩 refers to poetry with fixed forms (e.g., sonnet, haiku), while 不定型詩 is free verse without such constraints.
Compound of 不 (fu, 'not') + 定型 (teikei, 'fixed form') + 詩 (shi, 'poetry'). The term is a direct calque of English 'free verse'.