whimsical

Ususual is likely misspelled.

Ususual has no English definition.

As an adjective whimsical is

given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing.

As adjectives the difference between quizzical and whimsical

is that quizzical is questioning or suggesting puzzlement while whimsical is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing.

As adjectives the difference between whimsical and unfavorable

is that whimsical is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing while unfavorable is disadvantageous, adverse, unsuitable, inconducive; serving to hinder or oppose.

As adjectives the difference between whimsical and unpredictable

is that whimsical is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing while unpredictable is unable to be predicted.

As a noun unpredictable is

an unpredictable thing.

As an adjective whimsical

is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing.

As a verb routinise is

an alternative spelling of routinize.

As adjectives the difference between whimsical and whimmy

is that whimsical is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing while whimmy is full of whims; whimsical.

As adjectives the difference between whimsical and hobbyhorsical

is that whimsical is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing while hobbyhorsical is (colloquial) pertaining to, or having, a hobby or whim; eccentric; whimsical.

As adjectives the difference between whimsical and nonwhimsical

is that whimsical is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing while nonwhimsical is not whimsical.

As an adjective whimsical

is given to whimsy; capricious; odd; peculiar; playful; light-hearted or amusing.

As a noun whangdoodle is

a whimsical monster in folklore and children's fiction; a bugbear.