According to what I learnt, there are short and long adjectives.
Short adjectives: one syllable.
Long adjectives: two / three / four syllables.
All of those short adjectives (one syllable) get suffix of -er or -est in their comparative or superlative grades - correspondingly. (For example: fast, high, low, etc.)
Now my question regarding that are:
1) why is the adjective "wrong" which is one syllable doesn't get -er or -est?
The single-word comparative and superlative forms wronger and wrongest are no longer in common use, except humorously; rather, the locutions “more wrong” and “most wrong” are preferred.
2) Are there more examples for one syllable words which behave like the word "wrong"?
In the Cambridge grammar book that I use, they show examples for exceptions for two syllables that can get -er or -est (for example: quieter), but I didn't see that they mention any exception for one syllable rule (that should get -er or -est in the end in the comparative and superlative grades).