The rate at which hair grows can be agonizingly slow.

头发生长的速度可以慢得令人苦恼。

《柯林斯英汉双解大词典》

The tortoise crept along at an agonizingly slow speed.

那只乌龟以让人难受的慢速度爬行着。

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The tortoise crept along at an agonizingly slow speed.

乌龟以极其缓慢的速度爬行着。

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The strike, which attracted international attention, resulted in the agonizingly slow death of ten men.

NEWYORKER: Hunger

But so far, the product is off to an agonizingly slow start.

FORBES: Dendreon's Agonizingly Slow Start

The socialists want to offer voters an alternative to the two conservative blocs, but movement to link up with sympathizers in other parties has been agonizingly slow.

CNN: The Communists come back