formidable

As adjectives the difference between enormous and formidable

is that enormous is (obsolete)  deviating from the norm; unusual, extraordinary while formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment.

As adjectives the difference between ferocious and formidable

is that ferocious is marked by extreme and violent energy while formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment.

As adjectives the difference between doubtable and formidable

is that doubtable is capable of being doubted; doubtful; dubious; dubitable. See usage notes below.formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment.

As adjectives the difference between formidable and challenging

is that formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment while challenging is difficult, hard to do.

As a verb challenging is

.

As a noun challenging is

the act of making a challenge.

As adjectives the difference between formidable and rigorous

is that formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment 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 formidable and exciting

is that formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment while exciting is creating or producing excitement.

As a verb exciting is

present participle of lang=en.

As adjectives the difference between fearsome and formidable

is that fearsome is frightening, especially in appearance while formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment.

As adjectives the difference between formidable and arduous

is that formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment while arduous is needing or using up much energy; testing powers of endurance.

As adjectives the difference between prohibitive and formidable

is that prohibitive is tending to prohibit, preclude, or disallow while formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment.

As a noun prohibitive

is (linguistics) negative imperative.

As adjectives the difference between formidable and indomitable

is that formidable is causing fear, dread, awe or admiration as a result of size, strength, or some other impressive quality; commanding respect; causing wonder or astonishment while indomitable is incapable of being subdued, overcome, or vanquished.