不,不经常的英文怎么说

不经常的英语通常用词是"infrequently"，来源于拉丁语“infrequentia”，意思是稀少，不频繁。

例句：

I visit my grandparents infrequently due to my busy schedule. (因为我的日程安排很忙，我很少去看望我的祖父母。)
The train only runs infrequently, so we need to plan ahead. (火车只经常性开，所以我们需要提前计划。)
The company holds infrequent team building activities. (公司很少举办团队建设活动。)