dim

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Lacking in brightness: a dim room.
2. adj. Emitting only a small amount of light; faint: a dim lightbulb.
3. adj. Lacking luster; dull and subdued.
4. adj. Faintly outlined; indistinct: a dim figure in the distance.
5. adj. Obscure to the mind or the senses: a dim recollection of the accident.
6. adj. Lacking sharpness or clarity of understanding or perception. See Synonyms at dark.
7. adj. Lacking keenness or vigor.
8. adj. Negative, unfavorable, or disapproving: took a dim view of their prospects.
9. adj. Slang Dull; dimwitted.
10. v. To make or become dim.
11. n. A parking light on a motor vehicle.
12. n. A low beam.
13. n. Archaic Dusk.

Century Dictionary and Cyclopedia

1. Faintly luminous; somewhat obscure from lack of light or luminosity; dark; obscure; shadowy.
2. Not clearly seen; indistinct; obscured by some intervening medium imperfectly transparent, as mist or haze; misty; hazy; hence, figuratively, not clearly apprehended; faint; vague: as, a dim prospect; a dim recollection.
3. Dull in luster; lusterless; tarnished.
4. Not seeing clearly; having the vision obscured and indistinct, as the eye.
5. Not clearly apprehending; dull of apprehension.
6. =Syn.2. Indistinct, ill-defined, indefinite, shadowy, confused, mysterious, imperfect.
7. n. The dark; darkness; night.
8. To make dim, faint, or obscure; render less bright, clear, or distinct; becloud; obscure; tarnish; sully: as, to dim the eye; to dim the vision; to dim the prospect; to dim gold.
9. To become dim, faint, or obscure; fade.
10. An abbreviation of diminuendo.
11. n. An abbreviation of diminutive
12. n. of the Latin dimidius, one half.

Wiktionary

1. adj. Not bright or colorful.
2. adj. Not smart or intelligent.
3. adj. Indistinct, hazy or unclear.
4. adj. Disapproving, unfavorable: rarely used outside the phrase take a dim view of.
5. v. transitive To make something less bright.
6. v. intransitive To become darker.

GNU Webster's 1913

1. adj. Not bright or distinct; wanting luminousness or clearness; obscure in luster or sound; dusky; darkish; obscure; indistinct; overcast; tarnished.
2. adj. Of obscure vision; not seeing clearly; hence, dull of apprehension; of weak perception; obtuse.
3. v. To render dim, obscure, or dark; to make less bright or distinct; to take away the luster of; to darken; to dull; to obscure; to eclipse.
4. v. To deprive of distinct vision; to hinder from seeing clearly, either by dazzling or clouding the eyes; to darken the senses or understanding of.
5. v. To grow dim.

WordNet 3.0

1. v. become dim or lusterless
2. v. make dim or lusterless
3. adj. made dim or less bright
4. adj. lacking in light; not bright or harsh
5. v. become vague or indistinct
6. adj. lacking clarity or distinctness
7. adj. slow to learn or understand; lacking intellectual acuity
8. v. make dim by comparison or conceal
9. adj. offering little or no hope
10. v. switch (a car's headlights) from a higher to a lower beam