UNDOUBLE
\ʌndˈʌbə͡l], \ʌndˈʌbəl], \ʌ_n_d_ˈʌ_b_əl]\
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2010
- New Age Dictionary Database
By Oddity Software
1913
- Webster's Revised Unabridged Dictionary
By Noah Webster.
1908
- Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson