Many a times, we tend to meet someone who is ignorant yet arrogant; to the extent that they can go a long way blabbing about something they don't really know with so much vigour. What can you refer to such a person as?
Learn English – Word for someone who is ignorant and proud
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Also consider:
• opinionated, “Having very strong opinions” and, in the form self-opinionated, “Holding to one's own opinion obstinately, stubbornly and unreasonably”
• loudmouth or blowhard, “One who talks too much or too loudly, especially in a boastful or self-important manner”
• obnoxious (unpleasant, offensive, annoying, odious)
• eristic, “One who makes specious arguments; one who is is disputatious”
• bigoted, “having or revealing an obstinate belief in the superiority of one’s own opinions and a prejudiced intolerance of the opinions of others”
• egotist, “A person who believes in his own importance or superiority”
• bumptious, “Obtrusively pushy; self-assertive to a pretentious extreme”
• self important, “Having, or behaving as if having, too high an opinion of one's own importance”
• solipsist, “One who adheres to self-absorption and an ignorance of the views or needs of others”
• smart aleck or smart ass, “One who is pretentious about their own cleverness or knowledge; a know-it-all”
• wiseacre, “One who feigns knowledge or cleverness; an insolent upstart”; also “(obsolete) A learned or wise man”
Three of the above appear in Is there a word for a person who doesn't think the rules apply to him?. Also see:
• What's a word for an instance in which one has an opinion about something without having tried it?
• "Arrogant" vs. "conceited"
• A polite substitution for "lamer"
• Someone who forms their own opinion
• Ignorantly dishonest
• Is there a word to describe someone who tends to disagree with others only to upset them?.