hésiter, vaciller
Matias was wavering.
Matias hésitait.
— Elite Squad (2007)
You are wavering.
Vous hésitez.
Tom is wavering.
Tom hésite.
In BOPE wavering is the same as being useless.
En BOPE, hésiter équivaut à être inutile.
Is your faith wavering?
Votre foi vacille-t-elle ?
— Leviathan (2014)