No, 'prosperare' isn't an adjective. Instead, it's the infinitive form of the verb that's translated into English as 'to prosper'. But its past participle form, as 'prosperato'*, may be used as an adjective.
*That's the masculine singular form. The feminine singular is 'prosperata'. The plural forms are 'prosperati' in the masculine and 'prosperate' in the feminine.
From Latin 'prosperare' meaning cause to succeed and 'pro spere' according to expectation
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
It is an adjective.It is a an adjective.
An adjective
it is an adjective!
No. It is not an adjective. An adjective describes something.
Cautious IS an adjective. An adjective is an action!
No, it is an adverb. The adjective is clumsy.
It can be. "Ideal" is an adjective and a noun.
adjective
It is not an adjective. It is a noun based on the adjective unfit.
No, it is not an adjective; it is an adverb. The adjective form is "awkward."