Meaning of “slow” - Learner’s Dictionary

slow

adjective uk us /sləʊ/
NOT FAST

A1 moving, happening, or doing something without much speed:

I'm making slow progress with the painting.
He's a very slow reader.
be slow to do sth; be slow in doing sth

to take a long time to do something:

The government has been slow to react to the problem.
The ambulance was very slow in coming.
CLOCK

If a clock is slow, it shows a time that is earlier than the correct time.

BUSINESS

If business is slow, there are few customers.

NOT CLEVER

not quick at learning and understanding things

NOT EXCITING

not exciting:

I find his films very slow.

(Definition of “slow adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)