careful ⇔ careless
casual ⇔ formal
cheap ⇔ dear/expensive
clean ⇔ dirty
combine ⇔ separate
comedy ⇔ tragedy
complete ⇔ incomplete
consume ⇔ produce
danger ⇔ safety
dark ⇔ light
dead ⇔ alive
deep ⇔ shallow
defend ⇔ attack
demand ⇔ supply
departure ⇔ arrival
dependent ⇔ independent
descend ⇔ ascend
despise ⇔ respect
destroy ⇔ construct
direct ⇔ indirect
descend ⇔ ascend
distant ⇔ near
dull ⇔ sharp