Liddell-Scott-Jones

ἄκυρος (akuros) void ^G:A

ἄκυρος, ον,

without authority, opposed to κύριος, hence,

__I of laws, sentences, etc., invalid, unratified, obsolete, ψήφισμα[Refs 5th c.BC+]; ἄκυρον ποιεῖν, καταστῆσαι set aside, [Refs 5th c.BC+]; νόμοις ἀ. χρωμένη not enforcing the laws, [Refs 5th c.BC+]. adverb -ως[Refs 6th c.AD+]
__II of persons, having no right or power, ἄ. ποιεῖν τινά[Refs 5th c.BC+]; τινός over a thing, [Refs 5th c.BC+]: with infinitive, [Refs 5th c.BC+]
__II.2 of things, ἀκυροτέρα κρίσις less trust-worthy decision, [Refs 5th c.BC+]; ἄ. ἀμφορεύς voting urn into which neutral votes were thrown, [Refs 5th c.BC+]; τὰ ἀκυρότερα less important parts of nature, [Refs 4th c.BC+]; of bodily members, unimportant, ἄ. μόριον[Refs 2nd c.AD+]; impotent, [Refs 4th c.BC+]
__III of words and phrases, used in improper sense, [Refs 1st c.BC+]. adverb -ρως[Refs 5th c.BC+]