1.
bad, poor
Of low quality, not good, or unsatisfactory.
2.
sorry
Used colloquially to apologize or express regret.
悪い is an i-adjective meaning 'bad.' It's the opposite of いい/よい (good).
FORMS:
- 悪くない: not bad
- 悪かった: was bad
- 悪く: badly (adverb)
COMMON COLLOCATIONS:
- 天気が悪い: bad weather
- 目が悪い: poor eyesight
- 調子が悪い: not feeling well / not working properly
- 頭が悪い: not smart (can be offensive)
- 仲が悪い: on bad terms (relationship)
AS APOLOGY (casual):
- 悪い!: Sorry! My bad!
- 悪いね: Sorry about that
- 悪いけど...: Sorry, but...
These are casual. For polite apologies, use すみません or ごめんなさい.