unidentifiableadj.

1831 New Monthly Mag. 33 96/2 All abstractions were renounced as mere words incapable of being coupled with things, and so unidentifiable with their objects.

1865 Proc. Amer. Philos. Soc. 1862–4 9 105 No one Formation of the whole Palæozoic System is so variable and unreliable, and unidentifiable as Formation XII, the Great Conglomerate.

1923 M. Sadleir Desolate Splendour ix. 142 The small girl, in charge of her young uncle and the unidentifiable Margery, gambolled..across an uneven field.

1971 S. Hill Strange Meeting iii. 179 The hammering noise went on, only slightly muffled and then another, unidentifiable sound, though the voices had ceased.

2017 N.Z. Herald (Nexis) 27 Jan. If you're sick of seeing platters of unidentifiable charred meat coming off the hotplate, you're not alone.

1941 Rev. Econ. Stud. 8 153 The multiplicity of price-levels and the unidentifiability of the rouble as a standard of value..are well-known features of the Soviet rationing system.

1952 Biometrika 39 26 Only linear combinations can bring about unidentifiability except in some very special cases when there is functional dependence among lagged endogenous variates.

2017 R. Ubell Going Online iv. 35 Online, anonymity and unidentifiability may reduce inhibitions caused by social anxiety.

1906 T. Seccombe & W. R. Nicoll Bookman Illustrated Hist. Eng. Lit. II. vi. viii. 431/1 His [sc. Shelley's] head was small,..and he wore long hair, being described rather unidentifiably as both wild and gentle, awkward and graceful.

1934 F. M. Ford Let. 27 Sept. (1965) 235 I never guyed you either identifiably or unidentifiably.

1982 A. Price Old ‘Vengeful’ ii. 42 The new voice..was..unidentifiably classless.

2006 Daily Tel. (Nexis) 18 Feb. 10 Cascading xylophones, jazz guitars, upbeat riffs from unidentifiably obscure 1960s Asian funk tracks, bursts of classical strings.