This usage doesn't match any of the meanings given in our Blockbuster ..... less", which are both pairs of grammatical antonyms, but in usage are synonyms.
... word for
Define blockbuster. blockbuster
A thing of great power or size, in particular a film, book, or other p.... Meaning, pronunciation and example sentences, English to English reference content.
Nov 18, 2015
an aerial bomb containing high explosives and weighing from four to eight tons, used as a large-scale demolition bomb. 2. a motion picture, novel, etc., ...
a person or thing that is successful <the movie is expected to be the biggest
blockbuster of the summer>.