"more active"
The comparative and superlative degrees of "white" are formed in the standard way: "whiter" and "whitest" respectively.
more lasting, most lasting
more humid, most humid
The comparative and superlative degrees of clean are cleaner and cleanest.
"Dried" is the past and past participle of dry. As an adjective, the comparative and superlative forms of dry are drier and driest respectively.
Teapot is a noun and, as such, does not have a comparative degree.
"Less" is the comparative degree of little.
The comparative degree is bigger.
The comparative degree is wider.
Thriftier is the comparative degree of thrifty.
"Speed" is a noun and a verb and, as such, does not have a comparative degree. The comparative of the adjective speedy is speedier.
"Less" is the comparative degree of little. The superlative degree is least.
"Message" is a noun and (these days) a verb and, as such, does not have a comparative degree.
"More important" is the comparative degree of important.
The comparative degree of "sad" is "sadder."
comparative degree of amiable
The comparative degree of cheerful is more cheerful.Its superlative degree, then, is most cheerful.