unusual

As adjectives the difference between unusual and novel

is that unusual is unlike what is expected; differing in some way from the norm while novel is new, original, especially in an interesting way.

As a noun novel is

a novelty; something new.

Irregular is a synonym of unusual.

As adjectives the difference between unusual and irregular

is that unusual is unlike what is expected; differing in some way from the norm while irregular is nonstandard; not conforming to rules or expectations.

As a noun irregular is

a soldier who is not a member of an official military force and, often, does not follow regular army tactics.

Fanciful is a synonym of unusual.

As adjectives the difference between fanciful and unusual

is that fanciful is imaginative or fantastic; unreal or imagined while unusual is unlike what is expected; differing in some way from the norm.

As adjectives the difference between unusual and unnatural

is that unusual is unlike what is expected; differing in some way from the norm while unnatural is not natural; supernatural or artificial.

Unusual is a related term of idiosyncratic.

As adjectives the difference between unusual and idiosyncratic

is that unusual is unlike what is expected; differing in some way from the norm while idiosyncratic is peculiar to a specific individual; eccentric.

Unusual is a related term of unsuitable.

As adjectives the difference between unusual and unsuitable

is that unusual is unlike what is expected; differing in some way from the norm while unsuitable is not suitable; unfit; inappropriate.

Variable is a related term of unusual.

As a noun variable

is variable.

As an adjective unusual is

unlike what is expected; differing in some way from the norm.

Unusual is a related term of desultory.

As adjectives the difference between unusual and desultory

is that unusual is unlike what is expected; differing in some way from the norm while desultory is jumping, or passing, from one thing or subject to another, without order or rational connection; without logical sequence.

As adjectives the difference between very and unusual

is that very is true, real, actual while unusual is unlike what is expected; differing in some way from the norm.

As an adverb very

is to a great extent or degree; extremely; exceedingly.

Unusual is a related term of distinctive.

As adjectives the difference between unusual and distinctive

is that unusual is unlike what is expected; differing in some way from the norm while distinctive is that serves to distinguish between things.