Disparage (verb)

1. To speak of or treat with disrespect; to belittle.
2. To think or speak less of something or someone.

Origin:

From the old french desparagier, from the latin disparagium, from dis- + par equal.

Examples:

1. He disparaged her cooking in front of her guests.
2. She was known for disparaging her rivals in the industry.
3. The critics disparaged the new play as being poorly written.
4. He often disparaged his own abilities, but he was actually quite talented.
5. The teacher disparaged the student's work, causing the student to lose motivation.