っともない
mittomonai

i-Adjective

1. shameful; disgraceful; unsightly; indecent; unseemly; unbecoming; improper

Usually Written in Kana
人前 ひとまえでああいうみっともないことはするな。
hitomaede āiumittomonai kotowa suruna.
Don't do such a shameful thing in public.
Other forms: