Adjective (い)
Usually written in kana
1. bad(-tasting); unpalatable; unsavoury; unsavory; awful; terrible; unpleasant
飲み慣れない味だし、まずいし。It's a taste I'm not used to, and it's bad.
2. poor; unskillful; unskilful; bungling; clumsy
occ. as 拙い
3. ugly; unattractive; homely; plain
4. awkward; problematic; troublesome; unfavorable; unfavourable; unwise
いや、それはまずいでしょう。No, that would be problematic.
5. oh no; uh-oh; this is bad