Heavy-Footed Meaning

(idiomatic) Slow-moving.

Example: 2011 January 22, “Man Utd 5 - 0 Birmingham”[1], BBC:
  Nani's 76th-minute goal summed up Birmingham's state of mind as he skipped across the screen of their heavy-footed defence to slam a powerful goal past Foster from 15 yards into the corner of the net.