How do you pronounce the ending of "famous"? If you said /oʊs/ (like "oh-us") or /aʊs/ (like "house"), you are not alone, but you are wrong. The suffix -OUS is always pronounced as a simple /əs/, a quick schwa followed by an S sound. This is one of the most reliable pronunciation rules in English.
Once you internalize this rule, you will instantly improve your pronunciation of hundreds of English adjectives. Let's break it down.
The Core Rule: -OUS = /əs/
No matter what letters come before it, the -OUS ending is always reduced to /əs/. The O and U are never pronounced as individual vowel sounds. Think of -OUS as a single unit that always says /əs/.
Common -OUS Words
Notice the pattern: In every single word above, the ending is just /əs/. The letters O-U-S never form separate vowel sounds.
-IOUS and -EOUS: Hidden Sounds Before -OUS
This is where things get really interesting. When letters like TI, CI, or GE appear before -OUS, they create "hidden" consonant sounds that many learners miss entirely.
TI + OUS = /ʃəs/ (the "sh" sound)
When TI appears before -OUS, the T and I combine to create a /ʃ/ sound ("sh"). The -OUS still reduces to /əs/.
CI + OUS = /ʃəs/ (also the "sh" sound)
The same /ʃ/ sound appears when CI comes before -OUS.
GE + OUS = /dʒəs/ (the "j" sound)
When GE appears before -OUS, the G and E create a /dʒ/ sound (like the "j" in "jump").
XI + OUS = /kʃəs/ ("ksh" sound)
The X in "anxious" produces a unique combination.
-EOUS: The /niəs/ Pattern
Some -EOUS words add a /niəs/ sound, especially when preceded by ANE.
-UOUS: The /juəs/ Pattern
The -UOUS ending is special because the U before -OUS retains its /ju/ sound (or just /u/ after certain consonants). The result is /juəs/ or /uəs/.
Hidden Sounds Reference Table
Use this table to quickly identify the sound that letters before -OUS create.
| Letters Before -OUS | Sound Produced | Examples |
|---|---|---|
| TI + OUS | /ʃəs/ ("shus") | cautious, ambitious, infectious |
| CI + OUS | /ʃəs/ ("shus") | delicious, suspicious, precious |
| GE + OUS | /dʒəs/ ("jus") | gorgeous, courageous, outrageous |
| XI + OUS | /kʃəs/ ("kshus") | anxious, obnoxious |
| ANE + OUS | /niəs/ ("nee-us") | spontaneous, miscellaneous |
| U + OUS | /juəs/ ("yoo-us") | continuous, ambiguous, conspicuous |
| plain -OUS | /əs/ ("us") | famous, dangerous, nervous |
Common Mistakes to Avoid
Mistake 1: Pronouncing O and U Separately
- Wrong: "famous" as /ˈfeɪm-oʊs/ ("fame-ohs")
- Right: "famous" as /ˈfeɪməs/ (quick schwa, then S)
Mistake 2: Making -OUS Rhyme with "House"
- Wrong: "nervous" as /ˈnɜːrv-aʊs/ ("nerv-owse")
- Right: "nervous" as /ˈnɜːrvəs/ (the ending is unstressed and reduced)
Mistake 3: Missing the Hidden Sounds
- Wrong: "delicious" as /dɪˈlɪs-i-əs/ (pronouncing each letter)
- Right: "delicious" as /dɪˈlɪʃəs/ (CI + OUS = /ʃəs/)
Mistake 4: Stressing the -OUS Syllable
The -OUS syllable is almost never stressed. It should always sound light and quick. Putting stress on -OUS makes words sound unnatural.
Practice: More -OUS Words
Quick Summary
Here is everything you need to remember about the -OUS ending:
- -OUS is always /əs/. The O and U are never pronounced individually.
- TI and CI before -OUS create a /ʃ/ ("sh") sound: cautious, delicious, precious.
- GE before -OUS creates a /dʒ/ ("j") sound: gorgeous, courageous.
- -UOUS keeps the /ju/ sound: continuous, ambiguous.
- Never stress the -OUS syllable. It should be quick and light.
This is one of the most consistent rules in English pronunciation. There are virtually no exceptions. Every time you see a word ending in -OUS, you can confidently pronounce it as /əs/.
Want to master more pronunciation rules? Check out our guide on the silent E dropping rule for another reliable English pattern.