Definition of wacko in English:

wacko

(also whacko)

adjective

North American
informal
  • Mad; insane.

    ‘his willingness to pursue every wacko idea that enters his mind’
    • ‘We do get our share of wacko e-mails, but nothing on the scale you report.’
    • ‘In my own view I think that's a whacko statement.’
    • ‘I'd already done the book on Cobain's murder and I didn't want to get typecast in the book world as this wacko conspiracy nut.’
    • ‘The silence is all the more troubling since in the past the US news media has had no problem at all covering other wacko conspiracy theories, ones with far less evidence to support them.’
    • ‘We didn't mean to suggest that these wacko protesters represent a broad segment of the Canadian people, any more than similar groups represent the thinking of mainstream Americans.’
    • ‘Amid the live rampages and wacko tracks, it's important not to miss ‘Too Late the Hero,’ Entwistle's best ballad and a technically complex number.’
    • ‘A collection of awesome, eccentric, fascinating and completely whacko facts.’
    • ‘One of the perks of Adrants is that it spots new, whacko trends in the advertising world just about sooner than anyone.’
    • ‘Equally disturbing is what sort of messed up wacko ideas are floating around their heads regarding what is going on in the real world.’
    • ‘He is the kind of wacko leader that is very rare and perhaps not seen on the world stage for 50 years.’
    • ‘Maybe agreeing with their parents' wacko idea was going to be fun after all.’
    • ‘David Burke, a creator of animated whacko content for TV, has assembled a few brilliant scoundrels and put up a site filled with juvenile humor and neat animation.’
    • ‘I pretended to be a reporter so they didn't mark something down on DJ's record like wacko parent.’
    • ‘Not some fringe wacko doctor, but a doctor with significant power over a large hospital.’
    • ‘What separates him from the average band leader is his willingness to pursue just about every wacko idea that enters his mind.’
    • ‘There is plenty of wacko UFO coverage, including remarkable photos of blurry lights that just have to be flying saucers, because it's not like they could be anything else.’
    • ‘How long before someone charismatic, competent, and efficient takes charge of one of these wacko organizations?’
    • ‘Still, you have to admire his ability to make a long established religion seem like some sort of wacko cult.’
    • ‘At least you'll know you're not the only one dealing with all this wacko stuff.’
    • ‘I guess it was just a couple of wacko losers in Brazil with nothing better to do.’
    severely mentally ill, mentally ill, insane, mad, certifiable, deranged, demented, of unsound mind, out of one's mind, not in one's right mind, not together, crazed, maniac, maniacal, lunatic, unbalanced, unhinged, unstable, disturbed, distracted, stark mad, manic, frenzied, raving, distraught, frantic, hysterical, delirious, mad as a hatter, mad as a march hare
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noun

North American
informal
  • A crazy person.

    • ‘He just wasn't willing to break the law and refuse to follow a Federal court order, and for that outrageous sin, he is deemed just not quite nutty enough for this bunch of whackos.’
    • ‘‘All kinds of weirdos, wackos, whatever, were involved with us,’ he confides.’
    • ‘It appears to me to be one whacko testifying against another.’
    • ‘Clearly they get a lot of dumb illiterate wackos writing in, but I bet most publications do, quite frankly, and they don't publish 'em, by and large.’
    • ‘You'd better hope so, because now if he falls we have no way of controlling what whackos get hold of his nukes.’
    • ‘I'm happy to coordinate a group working through the Forum, but don't expect me to invite any of you psychotic whackos to my home for dinner and a movie.’
    • ‘If you are among the protesters whom the Wall Street Journal unaffectionately calls ‘Luddite whackos,’ you may take a little credit for that.’
    • ‘The seven-second delay is the system radio and TV stations have used for decades to filter out wackos and expletivists (hey!)’
    • ‘This is not to say we didn't get our share of itinerant whackos.’
    • ‘Nobody said anything scary, all the whackos were kept locked away somewhere.’
    • ‘What's the point, they're wackos and we shouldn't put them on TV.’
    • ‘Are you one of those wackos who still can't accept defeat?’
    • ‘Well, they finally admitted they agree on everything, you know, after months of trying to paint one another as wackos, they come out and tell us the awful truth.’
    • ‘At last the whackos were exposed, the pretenders unmasked.’
    • ‘I find it amazing that for a young nation such as ours, with such a small population, we have an abnormally large concentration of religious whackos.’
    • ‘And people might have said, ‘Oh, those Hollywood Democrats are a bunch of left-wing whackos.’’
    • ‘If anyone seriously suggests that then I think they're in wacko land.’
    • ‘No longer will they associate it with nutters, wackos and the irredeemably mad.’
    • ‘In any case, I do think that trying to characterize the anti-war movement by the wackos is just what I said: a misrepresentation of the political opposition.’
    • ‘You can't go far wrong with a foreign policy whose opponents are mainly dictators, anti-American European politicians and leftist whackos.’
    eccentric, oddity, odd fellow, unorthodox person, individualist, nonconformist, free spirit, bohemian, maverick, deviant, pervert, misfit, hippy, dropout
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Origin

1970s: from wacky + -o.

Pronunciation

wacko

/ˈwakō//ˈwækoʊ/