-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