foul

adjective

  1. 1

    especially of a ship's lines etc

    with its sails afoul

    a foul anchor

  2. 2

    disgustingly dirty; filled or smeared with offensive matter

    as filthy as a pigsty

    a foul pond

  3. 3

    characterized by obscenity

    had a filthy mouth

    foul language

  4. 4

    (of a baseball) not hit between the foul lines

noun

  1. 1

    an act that violates the rules of a sport

verb

  1. 1

    become soiled and dirty

  2. 2

    make unclean

    foul the water

  3. 3

    spot, stain, or pollute

    The townspeople defiled the river by emptying raw sewage into it

  4. 4

    make impure

    The industrial wastes polluted the lake

  5. 5

    commit a foul; break the rules

  6. 6

    hit a foul ball

  7. 7

    become or cause to become obstructed

    The leaves clog our drains in the Fall

    The water pipe is backed up

Synonyms

Also useful for “foul”:Unscrambler