So if the opposite of small is large…

Then what’s the opposite of medium?

extreme

W0LFB3AT5 said:
Then what’s the opposite of medium?

Don't know if it's recognized the same all over the world, but in the college level/above-college level Japanese linguistic sphere, "opposites" (in any language) are characterized as being able to fall into one of three determined groups. One type expresses "if not A then definitely B" (such as "man/woman," "adult/child,"). One expresses "an action or thing perceived as being in opposition" ("buy/sell," "come/go," "peace treaty/declaration of war"). And the final type expresses "opposing levels of a spectrum" ("long/short," "high/low").

Since "medium" expresses the middle point of a spectrum, it can't have an opposite word in the final group. And as it's an adjective and not an action or noun, the second group is also impossible. But the first group remains possible, and the corresponding "opposite word" would be said to be something along the lines of "irregular size(d)."