Thoroughsped is an archaic form of the word "thoroughly" which means completely or in a comprehensive way. It is pronounced as /ˈθʌrəspiːd/ and is spelled with the letters "th," "o," "r," "o," "u," "g," and "h." The "th" sound is represented by the letters "th," while the "o" sounds are pronounced as a diphthong with the first part being like the "o" in "hot" and the second part being like the "u" in "rude." The "r" is pronounced with a slight emphasis, and the "g" and "h" are silent.