This is the 1675th most frequent Chinese word.
顾
"顾" means "to look after," "to care about," or "to consider."
In this sentence, '顾虑' uses '顾' to indicate personal concern or worry.
她总是顾虑太多，所以难以做出决定。
She always worries too much, so it is difficult for her to make decisions.
Here, '顾不上' employs '顾' to mean paying attention or being able to attend to something.
他顾不上吃饭，因为工作太忙。
He can't spare time to eat because he is too busy with work.
The phrase '顾及' shows '顾' as referring to taking into account or considering something.