-less means without
breathless (adj) - without breath; out of breath
effortless (adj) - without having to try; easy
fearless (adj) - without fear; not afraid
motionless (adj) - without movement; still
odorless (adj) - without a smell
penniless (adj) - without money; poor
reckless (adj) - without responsibility; careless
speechless (adj) - without speech; lack of words; quiet
tireless (adj) - without getting tired; persistent
worthless (adj) - without value; not worth anything