List 4 (-less, de-, centi, under-)

Front

less

Back

without

Front

fearless

Back

without fear

Front

ruthless

Back

showing no pity or mercy to an opponent

Front

senseless

Back

does not make sense

Front

effortless

Back

requiring no effort

Front

faultless

Back

without fault

Front

centi

Back

100

Front

centipede

Back

having 100 feet

Front

centimeter

Back

100 units=1 meter

Front

percent

Back

per 100 or by 100