Antonyms for better

all:

worse.

excelling, more excellent:

unhealthy, littler, inferior, smaller, worse, tinier, Sicker.

noun:

unadvisable, harm, debase, blemish, impair, depress, corrupt, minor, inadvisable, spoil, tarnish, mar, vitiate.

better:

worse, inferior, deteriorate, worsen.

improve performance; outdo:

get worse, fall behind, fail, hinder, reduce, cease, impede, block, halt, be inferior, damage, lower, ruin, hurt, injure, lose, deteriorate, impair, corrupt, harm, worsen, check, decrease, obstruct, retreat, stop.