ill-defined

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

poorly stated or described
- he confuses the reader with ill-defined terms and concepts
• Syn:
unclear
• Ant:
well-defined
• Derivationally related forms:
unclearness (for: unclear)

• Từ trái nghĩa / Antonyms:
  well-defined, clear