The problems have 'retarded' the progress of the program.
The chemical will 'retard' the spread of fire.
(..) You shut up! Why you so upset? Get your goddamn clothes and get the hell out of here! You should be in a sideshow. You're so pathetic! Get out of here! - You retard! - Loser. You freak! Oh, no. I'm sorry I ruined your New Year's Eve party, Lieutenant Dan. She tastes like cigarettes. (..)1994 Forrest Gump