The word "stonest" is the second person singular present tense of the verb "stone". It is spelled using the IPA phonetic transcription as /stəʊnɪst/, which means there are two syllables in this word - "st" and "on-est". The "st" sound is similar to the "s" sound and the "t" sound pronounced together, while the "on-est" part is pronounced like "ohn-ist". The word "stonest" is a regular verb in English and is used to talk about pelting someone or something with stones.
The word "stonest" is derived from the Old English word "stanian" meaning "to become stony" or "to harden". It is the second person singular form of the verb "to stone", which originally referred to the act of pelting someone with stones as a form of punishment or execution. Over time, the verb expanded its meaning to also include the process of turning something into stone, often associated with petrification or mineralization.