Agile is a synonym of fast. Athletic is a synonym of fast.
The word is agile.
Quick or rapid
One "R" word for "fast" is rapid.
Act means to play a part. It begins with the letter a.
Abhorrent is a synonym for horrible. It begins with the letter A.
The speedometer shows how fast a vehicle is travelling. It begins with the letter s.
Likely candidate words are: self-made. sure-fire.
"Brza hrana" is a Croatian equivalent of "fast food."Specifically, the noun "hrana" means "food." The adjective "brza" means "fast, quick, rapid." But the English loan words "fast food" also will be recognized and understood.
Five letters, but two words: at war.
Some examples of words with the root "celer" are accelerate, decelerate, and celerity. These words all relate to speed or quickness.
An Arabic word that begins with the letter R is ramadi which means gray in English.
"Diagonal" begins with the prefix dia.
Velocity
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puma panther