Thriftier is the comparative degree of thrifty.
Thriftier
Teapot is a noun and, as such, does not have a comparative degree.
Poorer.
idler
more grand
more timorous
thriftier, thriftiest
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.
"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 word thrifty is short enough that the comparative and superlative forms are thriftier and thriftiest.