unrestable en · ADJ
Etymology
From un- + rest + -able.
Meanings
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(not-comparable) That cannot be rested.
The mind of Dr. Z., however, proved to be unrestable. It got some respite in making tables and cabinets but, first thing he knew, they had all kinds of machinery inside them.
1952, Marie Beynon Lyons Ray, The Best Years of Your Life, page 211: