As adjectives the difference between unaccessible and unattainable
is that unaccessible is inaccessible while unattainable is impossible to attain or reach; inaccessible, unobtainable or unapproachable; unable to accomplish; beyond limit.
As a noun unattainable is
anything that cannot be attained.
unattainable
English
Adjective
(
en adjective)
Impossible to attain or reach; inaccessible, unobtainable or unapproachable; unable to accomplish; beyond limit.
Noun
(
en noun)
Anything that cannot be attained.