The comparative form of exciting is "more exciting." The
superlative is "most exciting."
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most thrilling
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This is exciting.
Going to Six Flags is exciting.
I think it's exciting.
(Use it generally for same idea.)
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more exciting
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If you describe something as exciting, as in "This concert is
exciting", it is an adjective. If the word is used as in "The
battery is exciting the circuit", meaning exciting is an action,
then it is a verb.