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Requiring effort or concentration crossword clue

The answer is SERIOUS (7 letters).

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7 letters

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What “Requiring effort or concentration” means

adjective

“requiring effort or concentration; complex and not easy to answer or solve”

Example: raised serious objections to the proposal

Answers with this meaning: SERIOUS

Definition from Open English WordNet (CC BY 4.0).

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What is the answer to the “Requiring effort or concentration” crossword clue?

The answer is SERIOUS (7 letters).

How many letters are in the answer to “Requiring effort or concentration”?

The answer has 7 letters.