(1):

(superl.) Having, making, or being a strong or great sound; noisy; striking the ear with great force; as, a loud cry; loud thunder.

(2):

(superl.) Ostentatious; likely to attract attention; gaudy; as, a loud style of dress; loud colors.

(3):

(adv.) With loudness; loudly.

(4):

(superl.) Emphatic; impressive; urgent; as, a loud call for united effort.

(5):

(superl.) Clamorous; boisterous.