Solution

TAXING

2 clues

Demanding

Word class: Common adjective
Nature of clue: Synonym
Difficulty: Very easy
Sources: Boatload Puzzles

Other solutions to Demanding

Strenuous

Word class: Common adjective
Nature of clue: Synonym
Difficulty: Easy
Sources: Boatload Puzzles

Other solutions to Strenuous

Words are categorized by artificial intelligence: there can be mistakes.