what is the term given to an antonym of a superlative? For example Conrad uses phrases such as 'little, tiny and small' to describe the french colonialist's weapons, and I want to know the term to decribe these words.
I'm not exactly sure what you mean and I am not aware if there is such a thing as an "antonym for a superalative". A superlative refers to "the best/most/worst...etc.." structure. "Little", "tiny" and so on are simply adjectives.
Hope that helps!