The comparitive word for the color blue can have a debate. I choose to say "more blue", but other people choose to say "bluer". So I guess either way can be used.
bluer, bluest
There shouldn't be any, no colors can have degrees of comparison. Nevertheless, you could say (idiomatically) "blacker, the blackest".
"Litter" is a noun and a verb and, as such, does not have a comparative degree.
A comparative for the word ineffectual is more ineffectual.
smoother is comparative of word smooth.
The comparative is hotter.
comparative
Sharper is the comparative form of the word sharp.
comparative
comparative
Worse is the comparative word.
The comparative form of the word 'fast' is 'faster'.