What is a word that means "requires alot of work"?

Question

I need a word that means "requires a lot of effort" or "not without work"

This can be in any language, preferably english, but it has to be one word, maybe two.

Thanks

Answer 1

busy

Answer 2

Unkept

Answer 3

tedious

Answer 4

arduous, hard, laborious, serious, tall, tough, uphill (especially arduous and laborious)

Answer 5

application, toil, travail, sweat.

Answer 6

Assiduousness, diligence, exertion, undertaking, or strenuous.

Answer 7

According to me , the right word is 'strenuous'. Other words , you may  consider are ;

demanding,

exacting,

exhausting,

gruelling,

back-breaking,

tough and

taxing.

*