That retards; delaying, impeditive.

(technical) A retarded person; a person with retardation.

plural of retardate

That retards; retardative.

(transitive) To keep delaying; to continue to hinder; to prevent from progressing. / (transitive) To put off; to postpone. / (transitive, obsolete) To be slow or dilatory to perform (something).

Retardation; delay. / (music) A slowing down of the tempo; a ritardando. / (offensive, dated) A person with mental retardation.

Retardation; the act of retarding or delaying.

Of or pertaining to retardations.

(dated) mental retardation

So as to retard or hinder.