I agree with Antonio, Bruce,�and Lynne.
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"A Comprehensive Grammar Of The English Language", (Professor Randolph Quirk and others, page 462, 7.81), gives examples of�two-syllable adjectives that can most readily take the �er/est � forms, (the inflected forms).
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-y����� early, earlier, earliest;�� easy,�easier, easiest;�� funny, funnier, funniest;�� happy, happier, happiest:�� �noisy, noisier, noisiest;�� wealthy, wealthier, wealthiest;��� pretty, prettier, prettiest.
-ow�� mellow, mellower: mellowest;�� narrow, narrower, narrowest;�� shallow, shallower; shallowest.
-le���� able, abler, ablest; � feeble, feebler, feeblest;�� gentle, gentler, gentlest;�� noble, nobler, noblest;�simple, simpler, simplest.
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Three-syllable or longer adjectives can�ONLY take the �more/most � forms, (the periphrastic forms).
beautiful
~ more beautiful�[but NOT beautifuller]
~the most beautiful�[ but NOT beautifullest]
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Three-syllable adjectives with the negative �un � prefix, such as �unhappy � and �untidy �, are exceptions.
unhappy, unhappier, unhappiest
untidy, untidier, untidiest
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Participle forms, (Present Participle and Past Participle), which are used as adjectives regularly take ONLY the �more/most � forms, (the periphrastic forms).
interesting, more interesting, most interesting.
wounded, more wounded, most wounded.
worn, more worn, most worn.
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I hope that this helps.
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Les Douglas�
