uhn-din-EYE-uh-buhl
/ˌʌndɪˈnaɪəbəl/
undeniable is pronounced uhn-din-EYE-uh-buhl (/ˌʌndɪˈnaɪəbəl/). Undeniable means clearly true or not able to be denied or disputed. It describes something so evident or compelling that denial would be unreasonable. In usage, it often introduces a strong assertion or conclusion grounded in facts or persuasive reasoning.
Undeniable means clearly true or not able to be denied or disputed. It describes something so evident or compelling that denial would be unreasonable. In usage, it often introduces a strong assertion or conclusion grounded in facts or persuasive reasoning.
"The footage provided undeniable proof that the suspect was at the scene."
"Her talent is undeniable, and it quickly propelled her to fame."
"There is undeniable progress in the project, even if some milestones were missed."
Say it as /ˌənˌdiːˈnaɪ.ə.bəl/ in American and UK styles, with three stressed syllables: the primary stress on 'né' (the third syllable), and secondary stress on the 'di' segment. Begin with the unstressed 'un' (/ən/), then 'de' as a long /diː/, 'ni' as /ˈnaɪ/, followed by 'a' as schwa /ə/, and finish with 'ble' as /bəl/. Practice by breaking into syllables: un-DEE-NY-uh-bul. You’ll often hear it reduced in rapid speech to un-de-NY-uh-bəl, but clear pronunciation keeps the long /iː/ in 'di' and the /naɪ/ in 'ny'.
Mistake 1: Misplacing stress, sounding like un-DEE-nee-uh-bəl rather than UN-də-NEE-a-bəl. Correction: primary stress on the 'ny' part: /ˌənˌdiːˈnaɪ.ə.bəl/. Mistake 2: Slurring 'ni' and 'a' into a single syllable, making it /ˌənˌdiːˈnɪəbəl/. Correction: keep /ˈnaɪ/ as a distinct diphthong. Mistake 3: Rendering 'un-' as /ʌn/ instead of /ən/ in rapid speech; correction: use a reduced /ən/ at the start. Practice with slow pronunciation and then speed up while maintaining vowel clarity.
In US English, you’ll hear a rhotic 'r' absence or presence in surrounding words; the /ɪ/ -> /aɪ/ in 'ny' is clear, with /ə/ before the final /bəl/. UK tends toward non-rhoticity; the /r/ is often silent, and the final /əl/ may be lighter. Australian tends to a flatter /ɪə/ or /ɪə/ for some speakers, with less exaggerated diphthongs; 'di' remains /diː/ or /dɪ/ depending on speaker, and the final /əl/ is often weakened. Overall, the primary stress remains on the 'ny' syllable, but vowel qualities shift slightly with accent.
The difficulty lies in juggling four syllables with multiple vowel sounds: the long /iː/ in 'de', the /naɪ/ diphthong, and the final /ə.bəl/ sequence where /ə/ blends into /bəl/. Also, maintaining the correct four-syllable rhythm and stress pattern in fluent speech can be tricky. Practicing the sequence un-de-ni-a-ble, with deliberate emphasis on the long /iː/ and the /naɪ/ diphthong, helps you avoid common quick-slurs.
A unique aspect is the transition from the syllable /ˈnaɪ/ to the schwa in the 'a' syllable and then the final unstressed /bəl/. Students often misplace secondary stress or compress the middle syllables in casual speech. Focus on preserving the /ˈnaɪ/ diphthong and the final light -ble ending, ensuring the last syllable carries just enough energy to avoid sounding clipped.
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Undeniable comes from the combination of the prefix un- + the verb deni (from deny) + the suffix -able, yielding 'not-deny-able.' The root idea traces to Old French denier (to deny) from Latin negare (to deny), with the English noun denial dating to the 14th century. The prefix un- has long been used in English to form opposites, while -able signals capability or suitability. Over time, undeniable evolved from meaning 'not capable of being denied' to 'clearly true or evident.' By the 18th and 19th centuries, it carried stronger evaluative force in rhetoric and law, where an undeniable fact demanded acknowledgment. The word is now common across formal and informal contexts, often used to underscore persuasiveness, certainty, or the strength of evidence. First known uses appear in legal and scholarly prose as early as the 1600s, but it became part of standard vocabulary through later centuries as the language shifted toward more emphatic adjectives in argumentation and journalism.
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💡 These words have similar meanings to "undeniable" and can often be used interchangeably.
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Words that rhyme with "undeniable"
-ble sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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