<p><strong>Adjective</strong></p><ul><li>mentally deranged</li><li>demented</li><li>insane</li></ul><p><strong>Synonyms</strong></p><ul><li>lunatic</li><li>crazed</li></ul><p><strong>Antonyms</strong></p><ul><li>sane</li></ul><p><strong>Informal Description</strong></p><ul><li>unpredictable, nonconforming, or odd</li><li>All I can say is she's the craziest person I know.</li></ul><p><strong>Informal Synonyms</strong></p><ul><li>unusual</li><li>bizarre</li><li>singular</li><li>She always wears a crazy hat.</li></ul><p><strong>Informal Description</strong></p><ul><li>senseless</li><li>nonsensical</li><li>totally unsound</li><li>Surely you don’t plan to invest money in that crazy scheme!</li></ul><p><strong>Synonyms</strong></p><ul><li>foolhardy</li><li>imprudent</li><li>foolish</li></ul><p><strong>Informal Description</strong></p><ul><li>extremely busy, hectic, chaotic, etc.</li><li>Yesterday was such a crazy day I hardly had time to eat.</li></ul><p><strong>Informal Description</strong></p><ul><li>intensely enthusiastic; passionately excited (usually followed by about or for)</li><li>Like many kids, he was crazy for baseball and yearned to be a professional ballplayer.</li></ul><p><strong>Antonyms</strong></p><ul><li>dispassionate</li><li>cool</li></ul><p><strong>Informal Description</strong></p><ul><li>very enamored or infatuated (usually followed by about or for)</li><li>It's obvious he's just crazy about her.</li></ul><p><strong>Informal Description</strong></p><ul><li>intensely anxious or eager; impatient</li><li>I'm crazy to try those new skis.</li></ul><p><strong>Informal Description</strong></p><ul><li>very annoyed, frustrated, or bothered</li><li>It makes me crazy that some kids don't get a fair chance in life.</li></ul><p><strong>Informal Description</strong></p><ul><li>having an unusual, unexpected, or random quality, behavior, result, pattern, etc.</li><li>I'm back in Connecticut in a crazy twist of events, living in the same town where I grew up.</li></ul><p><strong>Slang</strong></p><ul><li>wonderful</li><li>excellent</li><li>perfect</li><li>That's crazy, man, crazy.</li></ul><p><strong>Archaic Description</strong></p><ul><li>likely to break or fall to pieces</li></ul><p><strong>Synonyms</strong></p><ul><li>passionate</li><li>impassioned</li><li>ardent</li></ul><p><strong>Antonyms</strong></p><ul><li>stable</li></ul><p><strong>Archaic Description</strong></p><ul><li>weak, infirm, or sickly</li></ul><p><strong>Antonyms</strong></p><ul><li>healthy</li><li>strong</li></ul><p><strong>Adverb</strong></p><ul><li>extremely</li><li>madly</li><li>December is a crazy busy month for us.</li><li>That new clothing store is crazy popular with teenage girls.</li></ul><p><strong>Noun</strong></p><ul><li>a person who is mentally deranged or insane</li></ul><p><strong>Informal Description</strong></p><ul><li>an unpredictable, nonconforming person; oddball</li><li>Next door is a house full of crazies who wear weird clothes and come in at all hours.</li></ul><p><strong>The Crazies</strong></p><ul><li>Informal. a sense of extreme unease, nervousness, or panic; extreme jitters</li><li>The crew was starting to get the crazies from being cooped up belowdecks for so long.</li></ul>