Strident (adjective)

1. Having a harsh, grating, or piercing quality or sound.
2. Having or showing strong opinions or feelings; assertive and forceful.

Origin:

Late 16th century: from latin strident- "creaking, screeching", from the verb stridere.

Examples:

1. The strident cries of the seagulls.
2. Strident political rhetoric.
3. She spoke in a strident tone.
4. The singer's strident voice.
5. He had a strident laugh.