stentorian

From Stentor, the herald of the Greek forces in the Iliad, whose voice was famous for its loudness, plus the suffix -ian. The word passed from Ancient Greek Στέντωρ into English.

The word kept close to its source: a single loud-voiced character in Homer's epic became the standard way to describe any booming voice.

No other English cognate is given in the record — the word stands alone as a tribute to one legendary shouter.