strenuous

As adjectives the difference between fearless and strenuous

is that fearless is free from fear while strenuous is urgent, ardent, zealous.

As an adjective strenuous

is urgent, ardent, zealous.

As a noun big is

a biological insulation garment; an air-tight, full-body suit intended to prevent the spread of contaminants.

As adjectives the difference between severe and strenuous

is that severe is severe, harsh while strenuous is urgent, ardent, zealous.

Bold is a synonym of strenuous.

As adjectives the difference between bold and strenuous

is that bold is courageous, daring while strenuous is urgent, ardent, zealous.

As a noun bold

is (obsolete) a dwelling; habitation; building.

As a verb bold

is to make (a font or some text) bold.

Potent is a related term of strenuous.

As adjectives the difference between potent and strenuous

is that potent is possessing strength while strenuous is urgent, ardent, zealous.

As a noun potent

is (tincture) a heraldic fur formed by a regular tessellation of blue and white t shapes.

Efficacious is a related term of strenuous.

As adjectives the difference between efficacious and strenuous

is that efficacious is effective; possessing efficacy while strenuous is urgent, ardent, zealous.

Energeticenergetical is a synonym of strenuous.

As an adjective strenuous is

urgent, ardent, zealous.

Audacious is a related term of strenuous.

As adjectives the difference between audacious and strenuous

is that audacious is showing willingness to take bold risks; recklessly daring while strenuous is urgent, ardent, zealous.

High-spirited is a related term of strenuous.

As adjectives the difference between high-spirited and strenuous

is that high-spirited is possessing a bold nature while strenuous is urgent, ardent, zealous.

Confident is a related term of strenuous.

As adjectives the difference between confident and strenuous

is that confident is very sure of something; positive while strenuous is urgent, ardent, zealous.

As a noun confident

is .