To keep delaying; to continue to hinder; to prevent from progress
retard the march of an army
To put off; to postpone.
to retard a rupture between nations
To be slow or dilatory to perform (something).
To decelerate; to slow down.
To stay back.
Delayed; delayed in development, hindered; impeded.
Having mental retardation; mentally deficient or underdeveloped.
Specifically, having an IQ below 70.
Extremely stupid.
Designating a parameter of an electromagnetic field which is adjusted to account for the finite speed of radiation.