na-adjective, noun which may take the genitive case particle 'no', noun
the worst; worst possible
Used as a noun, の-modifier, or na-adjective for the worst state, result, case, or quality among alternatives.
Antonyms: 最良
それは最悪の結果だった。
That was the worst possible result.
状況は最
The situation is the worst it could be.
na-adjective, interjection
Colloquial evaluative use, often said by itself as an exclamation meaning something like 'This is awful' or 'That sucks.'
うわ、最悪！財布を忘れた。
Ugh, this is awful! I forgot my wallet.
今日は最悪な一日だった。
Today was a terrible day.
adverb
in the worst case; if worst comes to worst
Colloquial adverbial use at the start of a clause; it is close to 最悪の場合 but shorter and more conversational.
最悪、タクシーで行けば間に合う。
In the worst case, we can take a taxi and make it on time.