strenuous

Strenuous is a related term of unfathomable.

As adjectives the difference between strenuous and unfathomable

is that strenuous is urgent, ardent, zealous while unfathomable is impossible to fathom or understand; incomprehensible.

Courageous is a related term of strenuous.

As adjectives the difference between courageous and strenuous

is that courageous is of a person, displaying or possessing courage while strenuous is urgent, ardent, zealous.

As adjectives the difference between tenuous and strenuous

is that tenuous is thin in substance or consistency while strenuous is urgent, ardent, zealous.

As adjectives the difference between daring and strenuous

is that daring is adventurous, willing to take on or look for risks while strenuous is urgent, ardent, zealous.

As a verb daring

is present participle of lang=en.

As a noun daring

is boldness.

Strenuous is a related term of impudent.

As adjectives the difference between strenuous and impudent

is that strenuous is urgent, ardent, zealous while impudent is not showing due respect; impertinent; bold-faced.

Strenuous is a related term of involved.

As adjectives the difference between strenuous and involved

is that strenuous is urgent, ardent, zealous while involved is complicated.

As a verb involved is

(involve).

As adjectives the difference between vigourous and strenuous

is that vigourous is while strenuous is urgent, ardent, zealous.

As adjectives the difference between strenuous and effortless

is that strenuous is urgent, ardent, zealous while effortless is without effort.

As adjectives the difference between feeble and strenuous

is that feeble is deficient in physical strength; weak; infirm; debilitated while strenuous is urgent, ardent, zealous.

As a verb feeble

is (obsolete) to make feeble; to enfeeble.

As adjectives the difference between strenuous and tricky

is that strenuous is urgent, ardent, zealous while tricky is hard to deal with, complicated.