gave fright (verb) scare: frighten someone
Sinonime: Jane/John Doe, X, bearding,
incognito, innominate, nameless,
pseudo, pseudonymous,
secret, so and so, such and such, unacknowledged, unattested, unavowed, unclaimed, uncredited, undesignated, undisclosed, unidentified, unnamed, unsigned, unspecified, what's his/her name, whatchamacallit, whatsis, you know who
Antonime: identified, known,
named