Question

 I am a FIVE letter word. I start with letter 'V' and contain only two vowels. I am used as an adjective. I mean 'without any intelligence or interest'.​

Answer 1

$\sf \red{vapid}$

$\bf{it \: is \: an \: adjective}$

vapid contains only two vowels

meaning:offering nothing that is stimulating or challenging; bland.

or

without any intelligence or interest'.

Answer 2

 I am a FIVE letter word. I start with letter 'V' and contain only two vowels. I am used as an adjective. I mean 'without any intelligence or interest'.

Vapid is the answer