3 syllables: can, cer, ous. Stress on can.
KAN-sur-uhs
/ˈkænsɚəs/
cancerous is pronounced KAN-sur-uhs (/ˈkænsɚəs/). It has three syllables (can-cer-ous), with the stress on "can". cancerous (adj.) describes tissue or cells that have malignant properties and can invade surrounding areas; it is also used metaphorically to mean aggressively harmful or dangerous. The term combines medical meaning with broader figurative usage, often implying a threatening, spreading influence. In pronunciation, the stress is on the first syllable: CAN-ser-ous.
cancerous (adj.) describes tissue or cells that have malignant properties and can invade surrounding areas; it is also used metaphorically to mean aggressively harmful or dangerous. The term combines medical meaning with broader figurative usage, often implying a threatening, spreading influence. In pronunciation, the stress is on the first syllable: CAN-ser-ous.
"The doctor found cancerous cells in the biopsy report."
"That rumor is cancerous to the team’s morale, spreading negativity."
"A cancerous tumor requires urgent treatment and monitoring."
CANC-er-ous: IPA US/UK/AU: /ˈkæn.sɚ.əs/ (US, rhotic vowel in 'er'); /ˈkæn.sə.rəs/ (UK, often non-rhotic in rapid speech; true IPA /ˈkæn.sə.rəs/ when fully pronounced); AU typically /ˈkænsəɹəs/ with a more centralized 'er' depending on speaker. Focus on clearly pronouncing CAN with a short a, then the schwa or r-colored schwa in the middle, ending with -ous as /əs/. Stress on first syllable.
Two frequent errors: 1) Slurring the middle syllable into a quick /s/ or /z/ sound, saying ‘CAN-sz-ous’; correct it to /ˈkæn.sɚ.əs/ with a clear central vowel in the middle. 2) Misplacing stress or flattening the ending, resulting in /ˈkæn.sə.rəs/; maintain primary stress on CAN and pronounce the final /əs/ clearly. Practice linking the syllables smoothly without adding extra consonants.
In US English you’ll hear rhoticity: CAN-sir-uss with a pronounced /ɚ/ in the middle. UK English often features a shorter, less rhotic middle vowel, more like CAN-sə-rəs. Australian English tends toward a slightly flatter vowel in the middle syllable and a crisp final /əs/. Overall, the main differences lie in rhoticity and vowel quality in the second syllable; the first and last syllables remain relatively stable.
Two main challenges: 1) The middle syllable /sɚ/ can be tricky because it combines a consonant cluster with a rhotic or reduced vowel. If you’re not careful, you might produce /sər/ too short or blend it with the final /əs/. 2) The ending /əs/ requires a relaxed syllable with a light, voiceless schwa; avoid turning it into /z/ or /ɪs/. Break it into CAN-sər-əs, then blend.
In 'cancerous', the initial C is /k/ as in CAN; it’s a hard /k/ before a and other vowels, not /s/. The /s/ sound appears in the second syllable as part of the /s/ cluster in /ˈkæn.sɚ.əs/. So: CAN (k) + -cer- (s) + -ous (/əs/). Ensure the first consonant is clearly /k/ rather than an /s/ sound.
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cancerous comes from Middle English cancerous, from Old French cancerous, from Latin cancer, canceris meaning “crab” or “tumor.” The word originally described malignant tumors, drawing on the crab-like spread of cancer cells (creeping invasion). The metaphorical extension to mean “infectious, spreading” or “malignant” developed in the 16th–18th centuries as medical terminology entered common discourse. The root cancer traces to Proto-Indo-European base kar- meaning “hard,” later associated with swelling in medical Greek and Latin terms; in English, the suffix -ous forms adjectives indicating possession or relation. First known use in English citations appears in medical texts around the 14th–16th centuries, gaining wider usage with the rise of systematic anatomy and pathology in the 18th–19th centuries, and expanding into figurative language in modern times.
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💡 These words have similar meanings to "cancerous" and can often be used interchangeably.
🔄 These words have opposite meanings to "cancerous" and show contrast in usage.
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Words that rhyme with "cancerous"
-ous sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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