nameless
adjective
[ ˈneɪmləs ]
• having no name or no known name.
• "some pictures were taken by a nameless photographer"
• (especially of an emotion) not easy to describe; indefinable.
• "a nameless yearning for transcendence"
Similar:
unspeakable,
unutterable,
inexpressible,
unmentionable,
indescribable,
abominable,
horrible,
dreadful,
appalling,
shocking,
awful,
terrible,
frightful,
indefinable,
vague,
obscure,
unspecified,
unspecifiable,