Nouns

(n)damp, dampness, moistnessa slight wetness

Verbs

(v)muffle, mute, dull, damp, dampen, tone downdeaden (a sound or noise), especially by wrapping
(v)damprestrain or discourage“the sudden bad news damped the joyous atmosphere”
(v)dampen, deaden, dampmake vague or obscure or make (an image) less visible“muffle the message”
(v)dampen, damp, soften, weaken, breaklessen in force or effect“soften a shock”, “break a fall”

Adjectives

(s)damp, dampish, moistslightly wet“clothes damp with perspiration”, “a moist breeze”, “eyes moist with tears”