Qualitative Adjectives can be used to describe the quality of living beings or non-living things. These adjectives are abstract by nature. They could be sensed only. They are gradable which means that they can form their own degrees.
The adjective GOOD is common among the words which we use in English language.
He is a good boy.
There are other tow adjectives related to the adjective GOOD. They are BETTER and BEST. So, they give us the degree of goodness. There are innumerable adjectives belonging to this type. English language is full of this type of adjectives to describe the nouns which sentences will usually have. Only this type of adjectives adds beauty and colours to the writings that we come across in English Language.