unmortised
/(ˌ)ʌnˈmɔːtɪst/adjective
That has not been mortised; especially not made or attached with a mortise; having no recess to accommodate a tenon.
Origin
Late 16th century; earliest use found in Henoch Clapham (fl. 1585–1614), writer on theology and preacher. From un- + mortised.