impossible

As an adverb hardly

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

As an interjection hardly

is not really.

As an adjective impossible is

not possible; not able to be done or happen.

As a noun impossible is

an impossibility.

As adjectives the difference between impossible and unthinkable

is that impossible is not possible; not able to be done or happen while unthinkable is incapable of being believed; incredible.

As a noun impossible

is {{cx|obsolete|lang=en}} an impossibility.

As an adjective impossible

is not possible; not able to be done or happen.

As a noun impossible

is an impossibility.

As a verb failed is

(fail).

As adjectives the difference between rare and impossible

is that rare is cooked very lightly, so the meat is still red (in the case of steak or beef in the general sense) while impossible is not possible; not able to be done or happen.

As a verb rare

is to rear, rise up, start backwards.

As a noun impossible is

{{cx|obsolete|lang=en}} an impossibility.

As adjectives the difference between impossible and impassable

is that impossible is not possible; not able to be done or happen while impassable is incapable of being passed over, crossed, or negotiated.

As a noun impossible

is {{cx|obsolete|lang=en}} an impossibility.

As adjectives the difference between impossible and impracticable

is that impossible is not possible; not able to be done or happen while impracticable is not practicable; impossible or difficult in practice.

As nouns the difference between impossible and impracticable

is that impossible is {{cx|obsolete|lang=en}} an impossibility while impracticable is an unmanageable person.

As adjectives the difference between impossible and futile

is that impossible is not possible; not able to be done or happen while futile is incapable of producing results; useless; not successful; not worth attempting.

As a noun impossible

is {{cx|obsolete|lang=en}} an impossibility.

As adjectives the difference between impossible and impractical

is that impossible is not possible; not able to be done or happen while impractical is not practical; impracticable.

As a noun impossible

is {{cx|obsolete|lang=en}} an impossibility.

Impossible is a synonym of intractable.

As adjectives the difference between impossible and intractable

is that impossible is not possible; not able to be done or happen while intractable is not tractable or to be drawn or guided by persuasion; not easily governed, managed, or directed; uncontrollable; incurable; violent; stubborn; obstinate.

As a noun impossible

is an impossibility.