Brain-busting - Crossword Clue

Below are possible answers for the crossword clue Brain-busting.

4 letter answer(s) to brain-busting

HARD
  1. produced without vibration of the vocal cords; "unvoiced consonants such as `p' and `k' and `s'"
  2. very strong or vigorous;
  3. with effort or force or vigor; "the team played hard"; "worked hard all day"; "pressed hard on the lever"; "hit the ball hard"; "slammed the door hard"
  4. to the full extent possible; all the way; "hard alee"; "the ship went hard astern"; "swung the wheel hard left"
  5. slowly and with difficulty; "prejudices die hard"
  6. not easy; requiring great physical or mental effort to accomplish or comprehend or endure; "a difficult task"; "nesting places on the cliffs are difficult of access"; "difficult times"; "why is it so hard for you to keep a secret?"
  7. causing great damage or hardship; "industries hit hard by the depression"; "she was severely affected by the bank's failure"
  8. characterized by effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueli

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