vain

Synonyms: arrogant big-headed boastful cocky conceited egocentric egoistic haughty high-and-mighty inflated narcissistic ostentatious overweening pleased with oneself proud puffed up self-important stuck-up swaggering swollen-headed vainglorious

Antonyms: modest shy

Synonyms: abortive barren bootless delusive delusory empty frivolous fruitless going nowhere hollow idle inefficacious insignificant in vicious circle misleading not a prayer no-win nugatory on a treadmill otiose paltry petty pointless profitless puny senseless shuck slight sterile time-wasting trifling trivial unavailing unimportant unnotable unproductive unprofitable valueless void worthless

Antonyms: possible