attenuated

(verb) weaken the consistency of (a chemical substance). Synonyms: rarefy, attenuate.

(verb) become weaker, in strength, value, or magnitude. Synonyms: attenuate.

(adj) of an electrical signal; reduced in amplitude with little or no distortion.

(adj) reduced in strength. Synonyms: attenuate, faded, weakened. Example: "The faded tones of an old recording."