extinguish C2+

/ɪkˈstɪŋɡwɪʃ/ to put out a fire or light; to bring to an end

indistinct C2+

/ˌɪndɪˈstɪŋkt/ not clear or sharply defined

indistinguishable C2+

/ˌɪndɪˈstɪŋɡwɪʃəbəl/ impossible to tell apart from something else