arduous

As an adjective arduous

is needing or using up much energy; testing powers of endurance.

As a noun cynics is

.

As adjectives the difference between torrid and arduous

is that torrid is very hot and dry while arduous is needing or using up much energy; testing powers of endurance.

As an adjective arduous

is needing or using up much energy; testing powers of endurance.

As a noun struggle is

strife, contention, great effort.

As a verb struggle is

to strive, to labour in difficulty, to fight (for or against), to contend.

As adjectives the difference between vigorous and arduous

is that vigorous is physically strong and active while arduous is needing or using up much energy; testing powers of endurance.

As adjectives the difference between arduous and painstaking

is that arduous is needing or using up much energy; testing powers of endurance while painstaking is carefully attentive to details; diligent in performing a process or procedure.

As a noun painstaking is

the application of careful and attentive effort.

Perplexed is a related term of arduous.

As adjectives the difference between perplexed and arduous

is that perplexed is confused or puzzled while arduous is needing or using up much energy; testing powers of endurance.

As a verb perplexed

is (perplex).

As a noun ordeal

is a painful or trying experience.

As an adjective arduous is

needing or using up much energy; testing powers of endurance.

Arduous is a related term of rigid.

As adjectives the difference between arduous and rigid

is that arduous is needing or using up much energy; testing powers of endurance while rigid is rigid.

As adjectives the difference between arduous and epic

is that arduous is needing or using up much energy; testing powers of endurance while epic is of, or relating to, an epic.

As a noun epic is

an extended narrative poem in elevated or dignified language, celebrating the feats of a deity or demigod (heroic epic) or other legendary or traditional hero.

As adjectives the difference between easy and arduous

is that easy is comfortable; at ease while arduous is needing or using up much energy; testing powers of endurance.

As an adverb easy

is in a relaxed or casual manner.

As a noun easy

is something that is easy.

As a verb easy

is to easy-oar (stop rowing).