WordWeb Online

1. Having or emitting a high-pitched and sharp tone or tones
   "a shrill gaiety";
   - sharp
    
2. Being sharply insistent on being heard
   "shrill criticism";
   - strident
    
3. Of colours that are bright and gaudy
   "a shrill turquoise"

1. Utter a shrill cry
   - shriek, pipe up, pipe

Derived forms: shrilled, shrills, shriller, shrillest, shrilling

See also: colorful [US], colourful [Brit, Cdn], high, high-pitched, imperative

Type of: call, cry, holler, hollo [non-standard], scream, shout, shout out, squall, yell