athematic
/ˌeɪθɪˈmætɪk/adjective
1
- Music (of a composition) not based on the use of themes【乐】（作品）无主题的。
2
- Grammar (of a verb form) having a suffix attached to the stem without a connecting (thematic) vowel【语法】（动词加后缀时）无词干元音的。