unattainable

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

impossible to achieve
- an unattainable goal
• Syn:
unachievable, undoable, unrealizable
• Similar to:
impossible
• Derivationally related forms:
unattainableness

• Từ đồng nghĩa / Synonyms:
  unachievable, undoable, unrealizable