1. A confused multitude of things
   "The attic was a clutter of old furniture, books, and forgotten mementos";
   - jumble, muddle, fuddle, mare's nest, welter, smother, scramble
    
2. Unwanted echoes that interfere with the observation of signals on a radar screen
   "The radar operator had to filter out the clutter to identify the true targets"

1. Fill a space in a disorderly way
   "The children cluttered up the living room with their toys";
   - clutter up

Derived forms: cluttered, clutters, cluttering

Type of: disorder, disorderliness, disturbance, fill, fill up, interference, noise, radar echo

Antonym: clear

Encyclopedia: Clutter, Bill