retarding
re-tard-ing
adjective
Describing something that causes a delay or slows down a process.
"A retarding force acted on the vehicle."
verb
Causing a delay or slowing the progress or development of something.
"The bad weather was retarding our journey."
Thesaurus
Synonyms: retard, cretin, changeling, half-wit, imbecile, idiot, moron, slow down, slow up, slow, decelerate, check
Antonyms: accelerate, quicken, speed, speed up