Re·tard v. t. [imp. & p. p. Retarded; p. pr. & vb. n. Retarding.]
1. To keep delaying; to continue to hinder; to prevent from progress; to render more slow in progress; to impede; to hinder; as, to retard the march of an army; to retard the motion of a ship; -- opposed to accelerate.
2. To put off; to postpone; as, to retard the attacks of old age; to retard a rupture between nations.
Syn: -- To impede; hinder; obstruct; detain; delay; procrastinate; postpone; defer.
adj : relatively slow in mental or emotional or physical
development; "providing a secure and sometimes happy
life for the retarded" [ant: precocious]