arduous

As adjectives the difference between arduous and baffling

is that arduous is needing or using up much energy; testing powers of endurance while baffling is puzzling and frustrating.

As a verb baffling is

present participle of lang=en.

As a noun baffling is

an act of foiling or thwarting.

As adjectives the difference between powerful and arduous

is that powerful is having, or capable of exerting power, potency or influence while arduous is needing or using up much energy; testing powers of endurance.

Disquieting is a related term of arduous.

As adjectives the difference between disquieting and arduous

is that disquieting is causing mental trouble or anguish; upsetting; making uneasy while arduous is needing or using up much energy; testing powers of endurance.

As a verb disquieting

is .

As a noun disquieting

is the act by which someone or something is disquieted.

Unyielding is a related term of arduous.

As adjectives the difference between unyielding and arduous

is that unyielding is not giving in; not bending; stubborn while arduous is needing or using up much energy; testing powers of endurance.

Crabbed is a related term of arduous.

As adjectives the difference between crabbed and arduous

is that crabbed is bad-tempered or cantankerous while arduous is needing or using up much energy; testing powers of endurance.

As a verb crabbed

is (crab).

As adjectives the difference between challenging and arduous

is that challenging is difficult, hard to do while arduous is needing or using up much energy; testing powers of endurance.

As a verb challenging

is present participle of lang=en.

As a noun challenging

is the act of making a challenge.

As adjectives the difference between stubborn and arduous

is that stubborn is refusing to move or to change one's opinion; obstinate; firmly resisting while arduous is needing or using up much energy; testing powers of endurance.

Unaccommodating is a related term of arduous.

As adjectives the difference between unaccommodating and arduous

is that unaccommodating is not accommodating while arduous is needing or using up much energy; testing powers of endurance.

Solid is a related term of arduous.

As an acronym solid

is (programming|object-oriented).

As an adjective arduous is

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

Grievous is a related term of arduous.

As adjectives the difference between grievous and arduous

is that grievous is causing grief, pain or sorrow while arduous is needing or using up much energy; testing powers of endurance.