Does he even sound less than reliable? (4)

I believe the answer is:

liar

I'm a little stuck... Click here to teach me more about this clue!

'does he even sound less than reliable?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

Can you help me to learn more?

(Other definitions for liar that I've seen before include "Teller of untruths" , "one telling a story" , "Dissembler" , "Teller of fibs" , "Perjurer" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app