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
Laureen	lə-REEN	English
InÉS	ee-NES	Spanish
Ognyan	-	Bulgarian
Clarice	['klæris]
LÁZÁR	-	Hungarian
Mihaela	mee-hah-YE-lah (Romanian), mee-HAH-el-ah (Croatian)	Romanian, Slovene, Croatian, Macedonian