Adjective
unbonded (not comparable)
Not bonded
Persistent carbenes The production of furoin from furfural is catalyzed by thiamine through a relatively stable carbene (an organic molecule containing unbonded valence electrons pairs at a carbon center). Source: Internet
The unbonded atoms are often a source of defects within the nanowire, and may cause the nanowire to conduct electricity more poorly than the bulk material. Source: Internet