un attainable (adjective) unattainable: inaccessible
Sinonime: aloof,
away,
beyond, beyond reach,
distant,
elusive,
far, far-off, faraway, impassable,
impervious, impracticable, inapproachable,
insurmountable, not at hand, out of the way, out-of-the-way,
remote, unachievable, unapproachable,
unavailable, unfeasible, ungettable, unobtainable, unreachable, unrealizable, unworkable