Unbidden thoughts of her ex-boyfriend kept creeping into her mind.
intrusion
Frequency:
60
%
The unbidden intrusion of paparazzi disrupted the celebrity's private event.
guest
Frequency:
45
%
An unbidden guest showed up at the party and caused quite a stir.
Idiomatic Expressions for unbidden
Phrase: unbidden guest
Meaning: an unexpected or unwelcome visitor
Usage: We had an unbidden guest show up at our party last night, causing quite a commotion.