A proper noun "loud" represents a placename, specifically an ellipsis of either river loud or loud township.

(colloquial) A loud sound or part of a sound.

(slang, uncountable) High-quality marijuana.

(of a sound) Of great intensity.

(of a person, thing, event, etc.) Noisy.

(of a person, event, etc.) Not subtle or reserved, brash.

(of clothing, decorations, etc.) Having unpleasantly and tastelessly contrasting colours or patterns; gaudy.

(of marijuana, slang) High-quality; premium; (by extension) having a strong or pungent odour indicating good quality.

Loudly.