希代未聞

きたいみもん

noun, no-adjective

•

unheard-of, unparalleled(yojijukugo)

希	hope, beg, request, pray, beseech, Greece, dilute (acid), rare, few, phenomenal
代	substitute, change, convert, replace, period, age, counter for decades of ages, eras, etc., generation, charge, rate, fee
未	un-, not yet, hitherto, still, even now, sign of the ram, 1-3PM, eighth sign of Chinese zodiac
聞	hear, ask, listen