3 syllables: In, fec, tious. Stress on fec.
in-FEK-shuhs
/ˌɪˈnfɛkʃəs/
Infectious is pronounced in-FEK-shuhs (/ˌɪˈnfɛkʃəs/). It has three syllables (In-fec-tious), with the stress on "fec". Infectious is an adjective describing something capable of being transmitted from one living organism to another, typically referring to diseases but also used metaphorically (e.g., infectious laughter). It connotes contagion or rapid spread, often implying a physical or social contagion that affects others quickly. The term emphasizes the transmissibility and contagious nature rather than severity alone.
adjectiveInfectious is an adjective describing something capable of being transmitted from one living organism to another, typically referring to diseases but also used metaphorically (e.g., infectious laughter). It connotes contagion or rapid spread, often implying a physical or social contagion that affects others quickly. The term emphasizes the transmissibility and contagious nature rather than severity alone.
"The doctors warned that the disease is highly infectious and requires quarantine."
"Her enthusiasm was infectious, lifting the spirits of the team."
"The rumor spread so quickly because it was almost infectious in its reach."
Pronounced in-FECK-shus, with the primary stress on the second syllable. IPA US/UK/AU: ɪnˈfɛk.ʃəs. Begin with a short initial /ɪ/ like in 'in', then the /f/ sound, then the stressed /ɛ/ as in 'bed', followed by /k/ and an unstressed /ʃəs/ 'shus'. Think: in-FECT-ious, but de-emphasize the 't'—the /t/ blends softly into /ʃ/ in many speakers. Mouth: lips relaxed for /ɪ/, upper teeth on lower lip for /f/, back of tongue high for /ɛ/ followed by a crisp /k/ release, then a light /ʃ/ and schwa /əs/. Audio reference: [link to standard pronunciation resource].
Two common errors: (1) Over-stressing the first syllable or the final -ous, saying in-FECT-ious with even stress; correct it by placing main stress on the second syllable: in-FECT-ious. (2) Mispronouncing the /ʃ/ as /tʃ/ or blending /k/ and /t/ into a hard /t/; keep /k/ release followed by a soft /ʃ/ before /əs/. Practicing the sequence ɪ n / f ɛ k / ʃ ə s helps; use minimal pair drills like ‘infectious’ vs ‘infectiousness’ to feel the transition.
US and UK share the same /ɪnˈfɛk.ʃəs/ phonology for the most part, with subtle rhoticity differences in connected speech; rhotic vs nonrhotic effects are minimal in this word. Australian English generally matches US/UK here, but Australians may reduce the /ɪ/ slightly and exhibit a crisper /ʃ/; overall, the two-syllable rhythm and secondary stress on -fect- are consistent. Ensure the /fɛk/ cluster is clean, not a pale /feɪk/.
The difficulty lies in the /ɪn-/ onset leading into a strong /ˈfɛk.ʃ/ cluster and the /ʃəs/ ending, which can blur in rapid speech. The /f/ and /ɪ/ can be influenced by surrounding vowels, causing a slight vowel reduction, while the /t/ often blends into /ʃ/ in casual speech. Practicing the transition from /ɪn/ to /ˈfɛk/ and keeping the /ʃ/ distinct helps clarity. This word also tests smooth syllable-timing due to the vowel sequence in two primary syllables.
The moment of contact between /f/ and /ɛ/ is critical: ensure the /f/ is voiceless, then raise the jaw slightly for the /ɛ/ without lengthening the vowel excessively. The final /əs/ can be lightly reduced to /əs/ or even /əs/ with schwa, depending on speed; focusing on the /ʃ/ before /əs/ helps prevent an unintended /t/ or /s/ sound. Mastery of the /k/ release leading into /ʃ/ is a small but decisive detail.
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Infectious comes from Medieval Latin infectiosus, from Latin infectus, past participle of inficere ‘to stain, taint’ (from in- ‘in, into’ + facere ‘to make). The sense broadened in Late Middle English to mean capable of causing infection. The term entered medical vocabulary to describe diseases that can be transmitted by pathogens. Over time, its figurative use appeared in the 18th–19th centuries to describe things that spread quickly by imitation or contagion (e.g., infectious laughter, infectious enthusiasm). The core root infect- conveys contamination or transfer of disease, with the suffix -ous indicating an adjective describing a quality or condition. First known use in English traces to moralized and medical writing that categorized diseases as ‘infectious’ as opposed to ‘infect’ conditions that were not communicable. In modern use, the word spans clinical contexts (viral/bacterial infections) and sociocultural contexts (infectious ideas, energy, or emotions). This evolution mirrors broader shifts in medicine and social psychology, where contagiousness becomes a metaphor for momentum and influence as well as literal transmission. The word remains standard in medical literature and everyday speech, with its pronunciation and stress pattern remaining stable across dialects.
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Words that rhyme with "Infectious"
-ive sounds
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