strenuous

As adjectives the difference between ambitious and strenuous

is that ambitious is possessing, or controlled by ambition; greatly or inordinately desirous of power, honor, office, superiority, or distinction while strenuous is urgent, ardent, zealous.

As adjectives the difference between energetic and strenuous

is that energetic is possessing, exerting, or displaying energy while strenuous is urgent, ardent, zealous.

As adjectives the difference between industrious and strenuous

is that industrious is hard-working and persistent; worksome while strenuous is urgent, ardent, zealous.

As adjectives the difference between strenuous and difficult

is that strenuous is urgent, ardent, zealous while difficult is hard, not easy, requiring much effort.

As a verb difficult is

to make difficult; to impede; to perplex.

As adjectives the difference between strenuous and troublesome

is that strenuous is urgent, ardent, zealous while troublesome is giving trouble or anxiety; vexatious; burdensome; wearisome.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective strenuous is

urgent, ardent, zealous.

As adjectives the difference between strenuous and exertive

is that strenuous is urgent, ardent, zealous while exertive is having power or a tendency to exert; using exertion.

As an adjective strenuous

is urgent, ardent, zealous.

As a noun hard is

stove, heater; an enclosed space in which fuel (usually wood) is burned to provide heating, usually for cooking.

As adjectives the difference between strenuous and fierce

is that strenuous is urgent, ardent, zealous while fierce is extremely violent, severe, ferocious or savage.

As adjectives the difference between robust and strenuous

is that robust is evincing strength; indicating vigorous health; strong; sinewy; muscular; vigorous; sound; as, a robust body; robust youth; robust health while strenuous is urgent, ardent, zealous.