He was known as a habitual procrastinator, always leaving things to the last minute.
She had a reputation as a chronic complainer, always finding something to gripe about.
Despite the good news, he remained a perpetual pessimist, always expecting the worst.
He had the potential to excel, but he was a consistent underachiever, never reaching his full capabilities.
She was known for being a repetitive excuse-maker, always coming up with reasons for her failures.