Is the R silent in comfortable?
Silent R: comfortable – Eva Easton's American English Pronunciation.
According to dictionary.com, the “r” isn't pronounced at all—their pronunciation is “kuhmf-tuh-buh l”.
COMF-der-ble. Three syllables.
In American English we maintain a real R sound. In British English, they don't when it's at the end of a word. Water, -er, -er. It's a very closed sound.
'Comfortable'. You look very comfortable this afternoon. Now in this word the 'L' is silent.
The vast majority of native English speakers worldwide pronounce every written < r >, including most speakers in America, Canada, Ireland, Scotland, India and Pakistan. These are known as 'rhotic' speakers.
The reason behind it is that it's a part of rules that any word which has consonant after R, or nothing after R, there will be a stress on the syllable before R and R are silent while pronouncing, e.g., mart, fork, bird. R is pronounced after a Vowel.
Wondering why comfortably is 4 syllables?
Four or three, depending on how you pronounce it; Some people pronounce it with three phonemes: cumf-ta-bil. Some people pronounce it with four: cumf-ort-a-bil.
Some common synonyms of comfortable are cozy, easy, restful, and snug. While all these words mean "enjoying or providing a position of contentment and security," comfortable applies to anything that encourages serenity, well-being, or complacency as well as physical ease.
Is r silent in hour?
Silent H. H is always silent in HONOUR, HOUR, HONEST, HEIR, VEHICLE & VEHEMENT. You don't say it after 'g' in GHOST, GHASTLY, AGHAST, GHERKIN & GHETTO, or after 'r' in RHINOCEROS, RHUBARB, RHYME and RHYTHM.
R is a consonant sound. A consonant is any letter in the alphabet that is not a vowel (vowels = a, e, i, o, u). your tongue changes the path of the air as you produce this sound. The air still comes out of your mouth, but its path is not straight because of the placement of your tongue.

Don't say the 'r' in 'world'! Not even a tiny bit, it is completely silent as it is followed by a consonant. The 'l' in world is dark because it comes after a vowel sound. Your tongue should raise at the back and the front, it is a very soft sound, not like the clear /l/ you find at the beginning of a word.
Example Sentences
These shoes aren't very comfortable for walking. I can't seem to find a comfortable position in this chair.
verb. com·fort ˈkəm(p)-fərt. comforted; comforting; comforts. transitive verb. : to give strength and hope to : cheer.
being in a state of physical or mental comfort; contented and undisturbed; at ease: to be comfortable in new shoes;I don't feel comfortable in the same room with her. (of a person, situation, etc.) producing mental comfort or ease; easy to accommodate oneself to or associate with: She's a comfortable person to be with.
Birthday begins with the B consonant sound where the lips are together, bb, bb, and the vocal cords are making some sound, bb, bb, bir-. It opens into the 'ur' as in 'her' vowel sound followed by the R consonant sound.
Tired is a one-syllable word that feels like a two-syllable word. That's because of the schwa-R sound.
GH = silent e.g. LIGHT. GH = /f/ e.g. ENOUGH.
Have you ever wondered why February has that random, silent first r? Well, February, like the names of most months, has Latin roots. It descended from Februarius, a month in the ancient Roman calendar. The name actually comes from the festival of februum, a purification ritual celebrated during the month.
Is R a hard sound?
The “r” sound is widely considered to be the most difficult sounds in the English language. Misarticulations can vary widely, but the most common “r” errors involve “w” substitutions (such as “wed” for “red”) or distortions (such as “teachuh” for “teacher”).
In the second, the 'R' in car is followed by the consonant /p/, so again we don't pronounce it. In the third example this 'R' is followed by the first vowel in the word alarm and so this 'R' is pronounced /kɑ:r əlɑ:m/. Lastly notice that written vowels are not important.
Rhoticity and non-rhoticity
English accents around the world are frequently characterized as either rhotic or non-rhotic. Most accents in England, Wales, Australia, New Zealand, and South Africa are non-rhotic accents, and in those English dialects, the historical English phoneme /r/ is pronounced except after a vowel.
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