infrequent

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

...John's infrequent visits to Topeka. ...約翰對托皮卡很少的幾次拜訪。

2. infrequentlyADV

The bridge is used infrequently. 這座橋很少有人用。