This aggressive sales target is not for the fainthearted, but the bonus is generous.

這個積極的業績目標不適合膽小的人，但獎金很豐厚。

Fainthearted investors sold their shares as soon as the market dropped slightly.

市場才稍微下跌，膽怯的投資人就賣掉了持股。

She was too fainthearted to ask her manager for a raise during the review.

她太過膽怯，不敢在考績面談時向主管要求加薪。