unachievable

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

impossible to achieve (Freq. 1)
- an unattainable goal
• Syn:
unattainable, undoable, unrealizable
• Similar to:
impossible
• Derivationally related forms:
unattainableness (for: unattainable)

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