infrequent
adj. 罕见的；稀少的；珍贵的；不频发的
例句
Muggings are relatively infrequent in this area.
在这个地区行凶抢劫事件相对少见。
《牛津词典》
Kids and teens who do read frequently, compared to infrequent readers, have more books in the home.
与不经常读书的孩子相比，经常读书的孩子和青少年的家里有更多的书。
He moved on, aimlessly, and in a little while the houses thinned, and the passers-by were infrequent.
他漫无目的地继续往前走，没过多久，房屋渐渐变得稀少，过路的人也不多了。
