annul

As an adjective obsolete

is obsolete, deprecated (computing).

As a verb annul is

to formally revoke the validity of.

In transitive terms the difference between destroy and annul

is that destroy is to put down or euthanize while annul is to dissolve (a marital union) on the grounds that it is not valid.

In lang=en terms the difference between annul and unwill

is that annul is to dissolve (a marital union) on the grounds that it is not valid while unwill is to annul or reverse by an act of the will.

As verbs the difference between annul and unwill

is that annul is to formally revoke the validity of while unwill is to annul or reverse by an act of the will.

As a noun unwill is

lack or absence of will; willlessness; undesire.

As a verb annul

is to formally revoke the validity of.

As an adjective infirmative is

(obsolete) tending to weaken, annul, or make void.

As verbs the difference between annul and unpray

is that annul is to formally revoke the validity of while unpray is to revoke or annul (something previously prayed for) by prayer.

As verbs the difference between annul and unvote

is that annul is to formally revoke the validity of while unvote is (archaic) to reverse or annul by vote.

As a verb annul

is to formally revoke the validity of.

As a noun annuller is

one who, or that which, annuls.

As verbs the difference between annul and obrogate

is that annul is to formally revoke the validity of while obrogate is (legal|rare) to annul a law by enacting a new law, as opposed to repealing the former law.

As verbs the difference between annul and cass

is that annul is to formally revoke the validity of while cass is (obsolete|transitive) to render useless or void; to annul; to reject; to send away.

As verbs the difference between annul and unkiss

is that annul is to formally revoke the validity of while unkiss is (obsolete) to cancel or annul something that was done or sealed with a kiss.