to say the least
US /tə seɪ ðə liːst/
UK /tə seɪ ðə liːst/

1.
gelinde gesagt, mindestens
used to indicate that one is understating something, or that the reality is more extreme or significant than what is being explicitly stated
:
•
The meeting was chaotic, to say the least.
Das Treffen war chaotisch, gelinde gesagt.
•
His performance was disappointing, to say the least.
Seine Leistung war enttäuschend, gelinde gesagt.