achingly

دردناک و دردآور، بشدت و به سختی، مضر

فوق العاده، به شدت، بی نهایت، بسیار
( منبع: فرهنگ معاصر پویا )

extremely
https://dictionary. cambridge. org/

if you are doing sth depressingly it means you are in low spirits and can't put up with the occured condition or circumstance.
achingly is the exact meaning of depressingly or sorely and etc.