He was a smart operator. Don't underestimate him.是什么意思？

He was a smart operator. Don't underestimate him.

他这个人精明圆滑，可别小瞧了他。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

smart

adj. 聪明的，敏捷的，漂亮的，整齐的；vi. 疼痛，感到刺痛，难过；n. 创伤，刺痛，疼痛，痛苦；vt. 引起…的疼痛（或痛苦、苦恼等）；adv. 聪明伶俐地，轻快地，漂亮地；

例句
He used to be as smart as anything...
他过去聪明绝顶。

operator

n. 经营者，操作员，电话接线员，运算符；

例句
The operator expects the ship to be out of commission until the end of September.
技工预计这艘船到9月底才能修好。

underestimate

vt. 低估，对…估计不足，看轻，把…的价值估计过低；n. 低估，估计不足，过低评价，过低估价，轻视；

例句
Classically, overweight people underestimate the volume of food that they consume.
一般来说，超重的人往往低估自己摄入食物的量。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。