← BackshareGuessboastful/ˈboʊstfəl/adjectiveTending to talk about yourself or your achievements in a proud and annoying way.His boastful attitude made him unpopular at work.She gave a boastful speech about her own role in the project.I find boastful people tiresome to be around.SynonymsconceitedvainarrogantAntonymshumblemodest