No, the adjective 'unusual' is a common adjective. A proper adjective is an adjective derived from a proper noun, for example Swiss cheese or Victorian architecture.
Vietnamese is the proper adjective for Vietnam.
The proper adjective for the proper noun 'Celt' is Celtic.Please note that a proper noun and a proper adjective is always capitalized.
Ghanian is the proper adjective for Ghana.
Since spice isn't a proper noun, it can't have a proper adjective. The adjective of spice is spicy.
Since writer is not a proper noun, it doesn't have a proper adjective.
"Unusual" is an adjective.
There is no verb "unusual" is an adjective.
The word unusual *is* an adjective, the negative of the adjective usual.A related adjective that has a different meaning is unused, the negative of the past participle used.
No. Unusual is an adjective, something that describes a noun.
Adjective
The proper adjective for southwest is "southwestern."
The proper adjective is Haitian.
The proper adjective for Portuguese is "Portuguese."
Vietnamese is the proper adjective for Vietnam.
The proper adjective for George is Georgian.
The proper adjective for Siam is Siamese.
Mayan is itself a proper adjective.