unidentifiable

Cannot be named

Unable to be identified or recognized.

Something unidentifiable lacks distinguishing features or falls outside familiar categories: an unidentifiable smell, the body was unidentifiable.

The word often suggests mystery or damage: unidentifiable remains, an unidentifiable flying object.

What's unidentifiable resists being named or classified.

ambiguous

vague

Unclear, ill-defined

fuzzy · murky · nondescript · featureless · shapeless · formless · amorphous · hazy · smudged · blurred

unknown

indeterminate

Not exactly known

nameless · undiscovered · unrecognized · unrecorded · untraceable · unspecified · untagged · unattributed · uncatalogued · unregistered

concealed

hidden

Kept out of sight

veiled · shrouded · cloaked · covered · obscured · incognito · undercover · undetectable · invisible · covert

mysterious

enigmatic

Puzzling and obscure

inscrutable · perplexing · baffling · puzzling · confounding · bewildering · strange · uncanny · elusive · mystifying

Opposites
recognizability

unidentifiableidentifiable

Able to be recognized

recognizable · recognisable · known · classifiable · categorizable

distinctiveness

unidentifiabledistinctive

Readily identifiable, set apart

unmistakable · characteristic · marked · conspicuous · telltale

Family

identity, identify, identical, identification, unidentified, identifying, de-identification, identifiable, identifier

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G