inflexibility
From LSJ
ξυνῆλθεν ἀτταγᾶς τε καὶ νουμήνιος → birds of a feather flock together, the francolin and the new-moon bird get together
ξυνῆλθεν ἀτταγᾶς τε καὶ νουμήνιος → birds of a feather flock together, the francolin and the new-moon bird get together