Definition of wackadoo in English:

wackadoo

(also whackadoo)

noun

US
informal
  • An eccentric or fanatical person:

    ‘he seems like a good guy even if he is a wackadoo’
    • ‘Please do not let one wackadoo ruin it for the rest of us.’
    • ‘Ellen is a hysterically needy wackadoo whom Jason takes up with when Stacy walks out on him.’
    • ‘Elevating these wackadoos to even the most carefully vetted legitimacy lowers a writer to an idiot.’
    • ‘Will we see fewer interviews with wackadoos in the street and just general mayhem?’
    • ‘Anyone who thinks an ugly planet is a healthy planet is a wackadoo.’
    • ‘It annoys the hell out of me when wackadoos like this reproduce!’
    • ‘Some of the whackadoos are partially correct.’
    • ‘I've just happened to come across quite a few wackadoos in my time.’
    • ‘His fanbase shifted from horny teens and MTV devotees to hardcore wackadoos.’
    zealot, extremist, militant, dogmatist, devotee, sectarian, bigot, chauvinist, partisan, radical, diehard, ultra, activist, apologist, adherent
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adjective

US
informal
  • Eccentric or fanatical:

    ‘out of the blue, he would do something completely wackadoo’
    • ‘So there is your factual evidence, but I'm sure you'll give some wackadoo response to justify your unique and frankly odd position!’
    • ‘The wackadoo radio host and conspiracy-monger is posting about this on Facebook and Twitter.’
    • ‘He hosts a whackadoo talk show, complete with offbeat musical happenings.’
    • ‘The worst part of it is the crazy, whackadoo headdress she makes her model wear.’
    • ‘In hindsight, though, they do seem like pretty whackadoo ideas.’
    • ‘Sure, the movie has some wackadoo charm but the modern remakes, recently released on Blu-ray and DVD, are just a waste of time.’
    • ‘It takes a little time to get over the wackadoo premise and for the show to really warm up.’
    • ‘I think he and Jill make a lovely whackadoo couple.’
    • ‘The five minutes Lloyd spends reprising his wackadoo role as the piranha-infatuated biologist are entertaining enough.’
    • ‘Luckily, they found an ad campaign that adequately suits his whackadoo personality.’
    enthusiastic, eager, keen, fervent, ardent, fervid, passionate, devoted, dedicated
    unconventional, uncommon, abnormal, irregular, aberrant, anomalous, odd, queer, strange, peculiar, weird, bizarre, off-centre, outlandish, freakish, extraordinary
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Origin

1950s: probably from wack or wacky.

Pronunciation

wackadoo

/ˈwakəduː/