fainthearted

But it's not for the fainthearted - or the claustrophobic.

The treatment wasn't for the fainthearted, even among its proponents.

However, life underground is not for the fainthearted.

In his telling, the prosecutors come across as fainthearted, lacking “energy” and “enthusiasm,” and “relentlessly negative.”

Beyond that are “the fainthearted,” she continued, “those who can’t make up their mind about joining our fight.”