John William Tuohy lives in Washington DC

Word stuff: Nocuous

nocuous \NAH-kyuh-wus\
Meaning harmful

"nocuous" and "innocuous" have immediate Latin predecessors: "nocuus" and "innocuus." (The latter combines "nocuus" with the negative prefix "in-.") Both words can also be traced back to the Latin verb "nocēre," meaning "to harm." Other "nocēre" descendants in English include "innocent" and "nocent" (which also means "harmful"). "Nuisance" (which originally meant, and still can mean, "a harm or injury") is a more distant relative.