non-standard
adjective uk/ˌnɒnˈstæn.dəd/ us/ˌnɑːnˈstæn.dɚd/
(NOT USUAL)
非标准的,不规则的
not normal or usual
The keyboard was fitted with a non-standard plug. 这个键盘安装了一个非标准插头。
(LANGUAGE)
(单词或短语)不规范的,不标准的
A non-standard word or phrase is not considered correct by educated speakers of the language.