Verses with the word slow in the New Testament (3 verses):

Luke 24:25
Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken:

Titus 1:12
One of themselves, even a prophet of their own, said, The Cretians are alway liars, evil beasts, slow bellies.

James 1:19
Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath: