sneer

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A scornful facial expression characterized by a slight raising of one corner of the upper lip.
2. n. A contemptuous facial expression, sound, or statement.
3. v. To utter with a sneer or in a sneering manner.
4. v. To assume a scornful, contemptuous, or derisive facial expression.
5. v. To speak in a scornful, contemptuous, or derisive manner.

Century Dictionary and Cyclopedia

1. To grin or laugh foolishly.
2. To grin; especially and usually, to grin or smile in a contemptuous manner; express contempt by a grimace marked by slight turning up of the nose.
3. To insinuate contempt by a covert expression; use words suggestive rather than expressive of contempt; speak derisively.
4. Synonyms Scoff, Sneer, Jeer, Gibe. Scoff is the strongest word for the expression of utter contempt or abhorrence by opprobrious lauguage. To sneer is to express contempt by more or less covert sarcasm. To jeer is to try to raise a laugh by sarcastic language. To gibe is to use contemptuous, mocking, or taunting expressions.
5. To treat or address with sneers; treat with contempt; sneer at.
6. To utter with a contemptuous expression or grimace.
7. To affect in a specified way by sneering.
8. n. A derisive or contemptuous grin or smile; an expression of the face marked by a slight turning up of the nose, and indicating contempt; a look of scorn, disdain, or derision; hence, the feeling thus expressed.
9. n. A verbal expression of contempt; an insinuation of scorn or derision by language more or less covert and indirect.
10. n. Synonyms See sneer, v. i.

Wiktionary

1. v. To raise a corner of the upper lip slightly, especially in scorn
2. n. A facial expression where one slightly raises one corner of the upper lip, generally indicating scorn.
3. n. A display of contempt; scorn

GNU Webster's 1913

1. v. To show contempt by turning up the nose, or by a particular facial expression.
2. v. To inssinuate contempt by a covert expression; to speak derisively.
3. v. rare To show mirth awkwardly.
4. v. To utter with a grimace or contemptuous expression; to utter with a sneer; to say sneeringly.
5. v. To treat with sneers; to affect or move by sneers.
6. n. The act of sneering.
7. n. A smile, grin, or contortion of the face, indicative of contempt; an indirect expression or insinuation of contempt.

WordNet 3.0

1. v. smile contemptuously
2. n. a contemptuous or scornful remark
3. n. a facial expression of contempt or scorn; the upper lip curls
4. v. express through a scornful smile