unsolicited

an email sent without the recipient's consent, typically for advertising; spam

a telephone call from someone that you do not know and are not expecting, often for sales

a digital message, such as a text or instant message, sent without prior consent

advice that is given without being asked for

physical letters or packages sent without the recipient's consent, often for advertising

a file sent with an email that the recipient did not request and may be malicious

something submitted for consideration, like a proposal or application, without being requested

a manuscript sent to a publisher by an author without being requested