unattainably
Adverb
Meaning
in an unattainable manner or to an unattainable degree
Source: WordNetSynonyms
unachievably
unreachably
ideally
impossibly
confidentially
exclusively
infeasible
impracticably
insurmountably
hopelessly
invincibly
impregnably
inaccessibly
impractically
unfeasibly
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Antonyms
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this house is unattainably expensive