The sun was a most unusual color last night. [error]
The answer to your question was more unusual than most. [correct, but confusing]
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In the above two examples, the first one is the superlative, not the comparative.
The comparative is formed either by adding the suffix "er" to a word or by placing the word "more" before it. With some words, you have a choice, which can be made according to your personal style and preference. With respect to the comparative of "unusual," however, common usage is not "unusualer" but rather "more unusual."
The superlative is formed either by adding the suffix "est" to a word or by placing the word "most" before it. Again, there is sometimes a choice. Common usage here dictates "most unusual" rather than "unusualest."
most thrilling
The comparative form of longest is longer.
The comparative form of gloomy is gloomier, the superlative form is gloomiest.
The comparative form of easy is easier, and the superlative form is easiest.
The comparative form of noisy is Noisier
most thrilling
more unusual
more unusual, most unusual
more unusual, most unusual
more unusual, most unusual
The comparative form of busy is busier.
The comparative form of dreamy is dreamier
The comparative form of friendly is friendlier.
comparative form is cleaner superlative form is cleanest
The comparative form of "central" is "more central."
The comparative form of many is more
The comparative form of "clean" is "cleaner."