backward × forward

bad × good

beautiful × ugly

before × after

begin × end

below × above

bent × straight

best × worst

better × worse, worst

big × little, small

black × white

blame × praise

bless × curse

bitter × sweet

borrow × lend

bottom × top

boy × girl

brave × cowardly

build × destroy

bold × meek, timid

bound × free

bright × dim, dull

brighten × fade

broad × narrow