Vain
/veɪn/
adjective
Overly proud of oneself, especially concerning appearance; having a high opinion of one's own accomplishments with slight reason.
Having no real substance, value, or importance; empty; void; worthless; unsatisfying.
Effecting no purpose; pointless, futile.
“vain toil; a vain attempt”
Synonyms: conceited, inflated, puffed up, fruitless, futile, ineffectual, pointless