I need some help to find adjectives that double the last consonant when working as comparatives.

I have some: wet, big, fat, thin, sad, red, hot, ........ Wold you help with some others?

Thanks in advance.
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I don't have time to add to your list right now, but if you're looking for a general rule: if the vowel before is "short" and there is no intervening consonant the consonant is doubled.
Hi Philip,

Thanks for your reply. What I see is that there are very few adjectives that are involved with that rule, I've found 11:

bad, big, fat, red, sad, tan, thin, wet, hot, flat, drab.

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How many do you need?

Of course, it's not the number, but I want to know if there are more than those ones.

Thanks for your reply.
bad? badder, baddest?
tan? tanner, tannest? (tanner is not an adjective)
There are no such words.

fit, glad, mad, glib, smug, snug, dim, glum, grim, prim, rum, trim, wan, hip
cruel (may or may not double the "l")
Couldn't find any more.
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Absolutely agree about bad, it was a huge slip. But I'm not sure about tan, in several lists they accepted as an adjective; moreover in http://www.answers.com/tan I found this:
adj., tan·ner, tan·nest.

  1. Light or moderate yellowish-brown to brownish-orange.
  2. Having a suntan.
  3. Used in or relating to tanning.

  4. Thanks for your examples!!
You may be able to find tanner/tannest in a few dictionaries, but most dictionaries I checked do not list them as acceptable words (including the Oxford English Dictionary). I would also object their status of being valid English words or even valid concepts in any language. We know that red, green and blue are the three basic colours of visible light. All other colours are combination of these three. You can only say redder/reddest, greener/greenest and bluer/bluest because you can define what is pure red, green and blue. On the other hand, you can't say oranger, browner, purpler, tanner etc. because such comparison is meaningless. How can you compare an orange colour that is closer to red with another one closer to yellow? Which one is oranger?
Longman defines tan as a light yellowish-brown colour. So, is tanner lighter, "yellower", or "browner"? You can have a deep tan or a light tan, but tanner is certainly an invalid concept.
Thanks for this long explanation. This is a good example of prescriptive grammar that does not correspond to the everyday use of the language. Sometimes this is hard to understand for the non-native speakers we are.

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