No. The word "if" is a subordinating conjunction, used to connect clauses or truncated clauses (e.g. the water, if pure, will freeze faster). The only exception is when it refers to itself as a word and becomes a noun (e.g. no ifs, ands, or buts).
it is an adjective!
Adjective.
The usual adjective is intrusive. The present participle intruding can also be an adjective.
sensible is an adjective
Russian IS an adjective.
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.
Cautious IS an adjective. An adjective is an action!
An adjective
it is an adjective!
No. It is not an adjective. An adjective describes something.
No, it is an adverb. The adjective is clumsy.
It can be. "Ideal" is an adjective and a noun.
No it's not a adjective, an adjective is a describing word.
adjective
No, it is not an adjective; it is an adverb. The adjective form is "awkward."
It is not an adjective. It is a noun based on the adjective unfit.