Antonyms of adj world-class

1 sense of world-class

Sense 1
first, foremost, world-class -- (ranking above all others; "was first in her class"; "the foremost figure among marine artists"; "the top graduate")

INDIRECT (VIA best) -> worst -- ((superlative of `bad') most wanting in quality or value or condition; "the worst player on the team"; "the worst weather of the year")

Similarity of adj world-class

1 sense of world-class

Sense 1
first, foremost, world-class -- (ranking above all others; "was first in her class"; "the foremost figure among marine artists"; "the top graduate")
       => best (vs. worst) -- ((superlative of `good') having the most positive qualities; "the best film of the year"; "the best solution"; "the best time for planting"; "wore his best suit")