Dirtier / more dirty ? Does the second one really exist?
Dirtier / more dirty ? Does the second one actually exist?
Yes, it does. It's less common than 'dirtier', but it certainly exists.
While it is true that we usually make comparatives of two-syllable adjectives ending in 'y' with 'ier', this isn't always the case. In fact, we have the option of using the alternative 'more + adjective' option with <em>any </em>adjective, regardless of the number of syllables. While adjectives of three or more syllables <em>must</em> form their comparative with 'more', those with one or two syllables <em>can - </em>but don't have to - use the 'ier' construction.
For stylistic reasons, we sometimes choose to use the alternative 'more + adjective' option. As in Hazel's example, you can add emphasis by saying 'even <em>more </em>dirty'. Or you might choose to say 'more dirty' in a list: for example, "It has become more disorganised, more dirty and more unpleasant than ever".
To sum up: It isn't common, but it isn't wrong, either.