Webster's 1828 Dictionary
UNATTAINABLE
a.Not to be gained or obtained; as unattainable good.
UNATTAINABLENESS
n.The state of being beyond the reach or power.
New American Oxford Dictionary
unattainable
un at tain a ble |ˌənəˈtānəbəl ˌənəˈteɪnəbəl | ▶adjective not able to be reached or achieved: an unattainable goal. DERIVATIVES un at tain a ble ness noun, un at tain a bly |-blē |adverb
Oxford Dictionary
unattainable
un |attain |able |ʌnəˈteɪnəb (ə )l | ▶adjective not able to be reached or achieved: an unattainable goal. DERIVATIVES unattainableness noun, unattainably adverb
American Oxford Thesaurus
unattainable
unattainable adjective an apparently unattainable target: unreachable, unachievable, unobtainable, impossible, unwinnable; unrealistic, implausible. ANTONYMS attainable. WORD TOOLKIT See impossible . Word Toolkits illustrate the difference between close synonyms by means of words typically used with them.
Oxford Thesaurus
unattainable
unattainable adjective an apparently unattainable target: unreachable, unachievable, unobtainable, impossible, unwinnable; unrealistic, implausible. ANTONYMS attainable. WORD TOOLKIT unattainable See impossible . Word Toolkits illustrate the difference between close synonyms by means of words typically used with them.
Sanseido Wisdom Dictionary
unattainable
ù n at t á in a ble 形容詞 成し遂げられない, 達しがたい .