It was hard to stop raining .
It was raining so hard .
hard [hɑ:d]
adj.努力的；硬的；困难的；辛苦的；确实的；严厉的；猛烈的；冷酷无情的
adv.努力地；困难地；辛苦地；接近地；猛烈地；牢固地