Progress is disappointingly slow.

进展慢得令人失望。

《柯林斯英汉双解大词典》

The result may be a disappointingly slow, fragile and jobless exit from recession.

其结果可能令人失望——缓慢地，不稳定地，且伴随着失业走出衰退。

youdao

As the report before you notes, progress in improving women's health is disappointingly slow.

如大家面前的报告所指出的，改善妇女健康进展缓慢，令人感到失望。

youdao

The Federal Reserve calls America's economic recovery "disappointingly slow."

VOA: special.2010.11.05

The building of a reprocessing plant at Rokkashomura, in Aomori prefecture, has been disappointingly slow.

ECONOMIST: Japan and Britain

You may gawp or flinch, but your pulse, like that of Dr. Lecter himself, will stay disappointingly slow.

NEWYORKER: Hannibal

After a deep recession, the U.S. economy has been growing since the middle of last year, but its growth has been disappointingly slow.

WSJ: Retailers November Sales Show Healthy Start to Holiday Season