loudly...
powerful
ou ou ou ou ou ou
No. It has the OW sound, which is not considered a long vowel and is indicated by /ou/. This is the sound in fowl (ow) and foul (ou).
Loudly or noisily. Also aloud will work
Lound
powerful
There do not seem to be any antonyms with a long O sound. There are the words loudly and noisily, which have the OW and OI sounds, respectively.
An antonym for silent is loud, the antonym for silently is loudly, or aloud.
ou ou ou ou ou ou
ou! ;)
Noisily
aloud
Silenced
The opposite of noisily is quietly or silently.
No. It has the OW sound, which is not considered a long vowel and is indicated by /ou/. This is the sound in fowl (ow) and foul (ou).
"OU" makes the "ow" sound, and the "e" at the end is silent.
The OU pair in house is the diphthong OU/OW as in how and mouse.