rigorous

As adjectives the difference between effective and rigorous

is that effective is having the power to produce a required effect or effects while rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

As a noun effective

is (military) a soldier fit for duty.

Rigorous is a related term of satirical.

As adjectives the difference between rigorous and satirical

is that rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration while satirical is of, pertaining to or connected with satire.

Rigorous is a related term of bitter.

As adjectives the difference between rigorous and bitter

is that rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration while bitter is having an acrid taste (usually from a basic substance).

As a noun bitter is

(usually in the plural bitters) a liquid or powder, made from bitter herbs, used in mixed drinks or as a tonic.

As a verb bitter is

to make bitter.

Hardly is a related term of rigorous.

As an adverb hardly

is (manner|obsolete) firmly, vigorously, with strength or exertion.

As an interjection hardly

is not really.

As an adjective rigorous is

manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

Constrained is a related term of rigorous.

As adjectives the difference between constrained and rigorous

is that constrained is within close bounds; confined while rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

As a verb constrained

is (constrain).

As adjectives the difference between rigorous and gruelling

is that rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration while gruelling is so difficult or taxing as to make one exhausted; backbreaking.

Rigorous is a related term of unmitigated.

As adjectives the difference between rigorous and unmitigated

is that rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration while unmitigated is not mitigated.

Rigorous is a related term of acrimonious.

As adjectives the difference between rigorous and acrimonious

is that rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration while acrimonious is angry, acid, and sharp in delivering argumentative replies: bitter; mean-spirited; sharp in language or tone.

As adjectives the difference between inflexible and rigorous

is that inflexible is not flexible; not capable of bending or being bent; stiff; rigid; firm; unyielding while rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

As adjectives the difference between enterprising and rigorous

is that enterprising is displaying bravery and daring in the attempt of some task while rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.