or slow coach
Examples from the Web for slowcoach
Slowcoach, a lumbering, dull person; one slow of comprehension.The Slang Dictionary|John Camden Hotten
Why, you got on pretty well till old Slowcoach came in, and then you certainly did go it, and no mistake!The Adventures of Mr. Verdant Green, Vols. I to III|Cuthbert Bede
Not being able to answer on the spur of the moment, he was nicknamed Κρόνος (the God, equivalent to “slowcoach”) by Ptolemy.
There was a kinsman of his, also named Thorbjorn, called Slowcoach.Grettir The Strong|Unknown