infrequent

1. ADJ If something is infrequent, it does not happen often. 很少发生的[usu ADV with v, also ADV with cl/group]

...John's infrequent visits to Topeka. ...约翰对托皮卡很少的几次拜访。

2. infrequentlyADV

The bridge is used infrequently. 这座桥很少有人用。