onerous

As adjectives the difference between lengthy and onerous

is that lengthy is having length; long and overextended, especially in time rather than dimension while onerous is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort.

As adjectives the difference between onerous and false

is that onerous is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort while false is (label) one of two states of a boolean variable; logic.

As adjectives the difference between ominous and onerous

is that ominous is of or pertaining to an omen or to omens; being or exhibiting an omen; significant while onerous is imposing or constituting a physical, mental, or figurative load which can be borne only with effort.

As adjectives the difference between onerous and oneiric

is that onerous is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort while oneiric is of or pertaining to dreams.

Onerous is a related term of efficacious.

As adjectives the difference between onerous and efficacious

is that onerous is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort while efficacious is effective; possessing efficacy.

Onerous is a related term of discouraging.

As adjectives the difference between onerous and discouraging

is that onerous is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort while discouraging is that causes discouragement.

As a verb discouraging is

.

As a noun discouraging is

discouragement.

As adjectives the difference between ornery and onerous

is that ornery is cantankerous, stubborn, disagreeable while onerous is imposing or constituting a physical, mental, or figurative load which can be borne only with effort.

As an adjective onerous

is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort.

As a noun burden is

.

As adjectives the difference between onerous and heavy

is that onerous is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort while heavy is (of a physical object) having great weight or heavy can be having the heaves.

As an adverb heavy is

heavily.

As a noun heavy is

a villain or bad guy; the one responsible for evil or aggressive acts.

As a verb heavy is

to make heavier.

As adjectives the difference between cumbrous and onerous

is that cumbrous is unwieldy because of its weight; cumbersome while onerous is imposing]] or [[constitute|constituting a physical, mental, or figurative load which can be borne only with effort.