This is awful. I can't believe I forgot to pay my electricity bills for three months!
この場合、次のような言い方ができますよ。
ーYour room is really inappropriate.
「あなたの部屋はまずいね」=「これはダメだなあ」
ーThis is awful. I can't believe I forgot to pay my electricity bills for three months!
「これはひどい。電気代を3ヶ月も滞納したなんて信じられない」=「これはダメだ」
ご参考まで!