“Upmost” can mean “uppermost,” referring to something on top. But usually this word is a mistake for “utmost,” meaning “most extreme.” “Utmost” is related to words like “utter,” as in “The birthday party was utter chaos.”

“Upmost” can mean “uppermost,” referring to something on top. But usually this word is a mistake for “utmost,” meaning “most extreme.” “Utmost” is related to words like “utter,” as in “The birthday party was utter chaos.”
