akuppa-dhamma
akuppa-dhamma:'unshakable',is one who has attained full mastery over the absorptions (jhāna,q.v.). In Pug. 4 it is said:
'What person is unshakable? If a person gains the meditative attainments of the fine-material and immaterial sphere (rūpāvacara-arūpāvacara); and he gains them at his wish,without toil and exertion; and according to his wish,as regards place,object and duration,enters them or arises from them,then it is impossible that in such a person the attainments may become shaken through negligence. This person is unshakable.