Yes, ‘uglier’ is a word. It is the comparative form of the adjective ‘ugly.’ In English, when we want to compare two things based on an adjective, we often use the comparative form. For example, if we have two objects and we want to express that one object is more unattractive than the other, we would say that it is ‘uglier.’
Adjectives in English can be modified to show comparison in different ways. For shorter adjectives like ‘ugly,’ we typically add ‘-er’ to create the comparative form. In contrast, for longer adjectives, we usually use ‘more’ to form the comparative. For instance, we say ‘more beautiful’ instead of ‘beautifuler.’
So, in summary, if you find something less aesthetically pleasing than another, you can correctly use ‘uglier’ to describe it.