āneñja: 'imperturbability', denotes the immaterial sphere (arūpāvacara; s. avacara); s. saṅkhāra. cf. M. 106.

Buddhist Dictionary, Manual of Buddhist Terms and Doctrines, by NYANATILOKA MAHATHERA

āneñja : [adj.] static; imperturbable.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Aneḷa (adj.) [an + eḷa = ena, see neḷa & cp. BSk. eḍa (mūka); Vedic anena] faultless, pure; only in foll. cpds.: ˚gala free from the dripping or oozing of impurity (thus expld. at DA i.282, viz. elagalana -- virahita), but more likely in lit. meaning "having a pure or clear throat" or, of vācā speech: "clearly enunciated" (thus Mrs. Rh. D. at Kindred Sayings i.241) Vin i.197 = D i.114 = S i.189; A ii.51, 97; iii.114, 195. Cp. also M Vastu iii. 322. -- ˚mūga same as prec. "having a clear throat", i. e. not dumb, fig. clever, skilled D iii.265; Sn 70 (= alālāmukha SnA 124), cp. Nd2 259.

Pali-English Dictionary, TW Rhys Davids, William Stede,