Definitions
1.adjectiveNot bright or colorful."The lighting was too dim for me to make out his facial features."
2.adjectiveNot smart or intelligent."He may be a bit dim, but he's not stupid."
3.adjectiveIndistinct, hazy or unclear."His vision grew dimmer as he aged."
4.adjectiveDisapproving, unfavorable: rarely used outside the phrase take a dim view of.
5.adjectiveLessened, reduced"The diminished Roman Empire never recovered from the sack of Rome."
6.adjectiveMade to seem less important, impressive, or valuable"She felt diminished by the report card."
7.adjectiveReduced by a semitone