0 used to show that what you are describing is in fact much more serious or important than you have suggested: --
It's going to be awkward, to say the least.
1 to not describe something in the strongest way you could, often in order to be polite: --
The dinner was not tasty, to say the least.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
to say the least