be slow on the uptake

to be slow to understand new ideas I tried to explain the new database, but they were remarkably slow on the uptake.

Name	Pronounced	Usage
Timoteo	tee-mo-TE-o (Italian, Spanish)	Italian, Spanish, Portuguese
Alia (1)	-	Arabic
Adolphus	[ə'dɔlfəs]
Jeffrey	JEF-ree	English
&Thorn;ÓRir	-	Icelandic, Ancient Scandinavian
Gerdina	-	Dutch