wacko
/ˈwæ.koʊ/adjective, noun, interjection
wacko is spelled W-A-C-K-O: 5 letters and 2 syllables. It appears about once in every 4 million words in written English, the 60,838th most frequent word form (wordfreq, 2021 data). As a derogatory adjective, wacko means “Amusingly eccentric or irrational” (English Wiktionary, September 2026).
How many letters and syllables are in wacko?
| Letters | 5: W-A-C-K-O |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | about once in every 4 million words; the 60,838th most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is wacko?
Wacko appears about once in every 4 million words in written English, the 60,838th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce wacko?
- UK /ˈwæ.kəʊ/
- US /ˈwæ.koʊ/
Wacko has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-wacko.oga, Wikimedia Commons (author and licence on each file's page).
What rhymes with wacko?
One word on PlainSpell end in the same sounds as wacko from its last stressed vowel (/ækoʊ/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of wacko
- more wacko comparative
- most wacko superlative
- whacko
- wackos plural
- wackoes plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does wacko mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
derogatoryinformalslangAmusingly eccentric or irrational.
noun
- 1
derogatoryslangAn amusingly eccentric or irrational person.
interjection
- 1
UKdatedHurrah!
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Wacko in Spanish, French, German and Portuguese
In the sense amusingly eccentric or irrational:
| Language | Words |
|---|---|
| German | durchgeknallt, spinnert, schrill |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does wacko come from?
From wack(y) + -o.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).