Brain-busting - Crossword Clue

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

4 letter answer(s) to brain-busting

HARD
  1. causing great damage or hardship; "industries hit hard by the depression"; "she was severely affected by the bank's failure"
  2. with firmness; "held hard to the railing"
  3. 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?"
  4. earnestly or intently; "thought hard about it"; "stared hard at the accused"
  5. characterized by effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"
  6. with pain or distress or bitterness; "he took the rejection very hard"
  7. dried out; "hard dry rolls left over from the day before"
  8. very near or close in space or time; "it stands hard by the ra

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