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- simple past tense and past participle of
unbound (not comparable)
- Not bound; not tied up.
- The hostages' hands were left unbound.
- Without a binding.
- an unbound book
- (nuclear physics, of an atomic nucleus) Lying beyond the proton or neutron drip line; having a negative particle separation energy; capable of decaying by the spontaneous exothermic emission of one or more nucleons.
- Helium-2 is unbound, as it is energetically favorable for it to split into two separate protons.
not bound or tied up