The Slow Of Meaning. So dense he never understands anything I say to him. Lasting or taking a long time.

Medical Dictionary 2009 Farlex and Partners. Moving happening or doing something without much speed. Its meaning of something that takes a long time has been in usage since the early 13th century.
Traffic was delayed by the bad weather.
To slow-walk means the same as dragging ones feet. Exhibiting retarded speed as the pulse. Moving or proceeding at less than the normal desirable or required speed. Medical Dictionary 2009 Farlex and Partners.