tarnished

Verb

• make dirty or spotty, as by exposure to air; also used metaphorically
  • "The silver was tarnished by the long exposure to the air"
• simple past and past participle of tarnish

Adj

• Discolored or blemished.
• Sullied or dishonored.

Synonyms

defile, maculate, stain, sully, tarnish