As adjectives the difference between spiritless and lustless

is that spiritless is lacking energy, drive, motivation or emotion enervated while lustless is without sexual lust.

As an adjective derivative

is .

As a noun diethylamide is

(organic compound) the derivative of a compound formed by adding an amide group with two ethyl substituents, n(c₂h₅)₂.

As nouns the difference between amide and diethylamide

is that amide is any derivative of an oxoacid in which the hydroxyl group has been replaced with an amino or substituted amino group; especially such derivatives of a carboxylic acid, the carboxamides while diethylamide is the derivative of a compound formed by adding an amide group with two ethyl substituents, N(C₂H₅)₂.

As nouns the difference between ethyl and diethylamide

is that ethyl is while diethylamide is (organic compound) the derivative of a compound formed by adding an amide group with two ethyl substituents, n(c₂h₅)₂.

Diethylamine is a related term of diethylamide.

In organic compound|lang=en terms the difference between diethylamine and diethylamide

is that diethylamine is (organic compound) the secondary amine (ch₃ch₂)₂nh while diethylamide is (organic compound) the derivative of a compound formed by adding an amide group with two ethyl substituents, n(c₂h₅)₂.

As nouns the difference between diethylamine and diethylamide

is that diethylamine is (organic compound) the secondary amine (ch₃ch₂)₂nh while diethylamide is (organic compound) the derivative of a compound formed by adding an amide group with two ethyl substituents, n(c₂h₅)₂.

As an adjective lustless

is without sexual lust.

As an adverb lustlessly is

in a lustless manner.

As nouns the difference between mercenary and merc

is that mercenary is a person employed to fight in an armed conflict who is not a member of the state or military group for which they are fighting and whose prime or sole motivation is private gain while Merc is a Mercedes car.

As an adjective mercenary

is motivated by private gain.

As adjectives the difference between mazelike and labyrinthian

is that mazelike is like a maze; labyrinthine while labyrinthian is mazelike, having long corridors and passageways that seemingly have no exit.

Imperfectibility is an alternative form of imperfectability.

As nouns the difference between imperfectibility and imperfectability

is that imperfectibility is the state or quality of being imperfectible while imperfectability is the quality of not being perfectable; of being forever imperfect.

Perfectable is likely misspelled.

Perfectable has no English definition.

As a noun imperfectability is

the quality of not being perfectable; of being forever imperfect.