Longman Dictionary of Contemporary English
screamingly
adverb
EXAMPLES FROM CORPUS
▪ A Pentium Pro computer running 32-bit software in a pure 32-bit operating system is screamingly fast compared with current models.
▪ I thought it was screamingly funny.
▪ Usually screamingly conspicuous because they're such a new, unfamiliar concept for most tourists.
Wiktionary
screamingly
adv. While screaming, or as if screaming
WordNet
screamingly
adv. to an extreme degree; "screamingly funny"
Usage examples of "screamingly".
The postcards dealing with honeymoon couples always have the enthusiastic indecency of those village weddings where it is still considered screamingly funny to sew bells to the bridal bed.
And she did tell the quaintest stories with the most screamingly funny, completely unconscious points.
The brazen bells shrieked, clanged, clashed, roared, twanged, jangled, and screamingly wrangled.
This was the front, the formal entrance, but the adjective was screamingly inappropriate for what she beheld: Victorian Gothic at its best, or worst, with the wonderful indifference to coherence that had marked some of the more entertaining examples of the genre.