adjectival noun or quasi-adjective, takes genitive case の, noun

  1. worst.

adjectival noun or quasi-adjective, interjection

Colloquialism.
  1. horrible, horrid, awful, terrible.

adverb

Colloquialism.
  1. in the worst case, if worst comes to worst.

Variations

Pronunciation Kanji Kana Is Common
最悪 さいあく

Contained Kanji Breakdown

utmost, most, extreme
サイ もっと.も も (4th, N3)
day, sun, Japan
ひ にっ ニチ (1st, N5)
take, fetch, take up
と.る シュ とり (3rd, N3)
ear
みみ ジ がみ (1st, N3)
or again, furthermore, on the other hand
また ユウ やす (8th, N1)
bad, vice, rascal
わる.い アク オ (3rd, N4)
Asia, rank next, come after
ア つ.ぐ や (9th, N1)
two, two radical (no. 7)
ニ ふた ふだ (1st, N5)
mouth
くち コウ ク (1st, N4)
heart, mind, spirit
こころ シン (2nd, N4)