unfriend
verb
un·friend ˌən-ˈfrend 
unfriended; unfriending; unfriends
transitive verb
: to remove (someone) from a list of designated friends on a person's social networking website
Example Sentences
Recent Examples on the Web Be sure to hide your friend lists and even temporarily unfriend those who share your last name. 
Heather Kelly, Washington Post, 1 May 2022 Acquaintances unfriend adherents on Facebook, and in real life, after seeing one too many posts calling NASA a satanic psyop. Kelly Weill, The Atlantic, 27 Feb. 2022 In those cases, limiting your interactions with those posts through an unfollow or unfriend may be best. Madeline Holcombe, CNN, 17 Nov. 2021 Talk show host Jimmy Kimmel said today is the day to unfriend them. Madeline Holcombe, CNN, 17 Nov. 2021 Some had gone so far as to unfriend people who seemed particularly clueless. Washington Post, 23 Mar. 2021 People are very loath to actually unfriend or stop following a person altogether. Megan Marples, CNN, 26 Feb. 2021 While some people choose to take a social media hiatus and delete apps, others might just unfriend people who have different political views. USA TODAY, 28 Jan. 2021 Ewell's alleged post, a screenshot of which was originally reported in The Virginian-Pilot newspaper, implored any Facebook friends who may have voted for Biden or are Democrats to unfriend him on the social media platform. Alec Snyder And Jonathan Kubiak, CNN, 17 Nov. 2020 See More
Heather Kelly, Washington Post, 1 May 2022 Acquaintances unfriend adherents on Facebook, and in real life, after seeing one too many posts calling NASA a satanic psyop. Kelly Weill, The Atlantic, 27 Feb. 2022 In those cases, limiting your interactions with those posts through an unfollow or unfriend may be best. Madeline Holcombe, CNN, 17 Nov. 2021 Talk show host Jimmy Kimmel said today is the day to unfriend them. Madeline Holcombe, CNN, 17 Nov. 2021 Some had gone so far as to unfriend people who seemed particularly clueless. Washington Post, 23 Mar. 2021 People are very loath to actually unfriend or stop following a person altogether. Megan Marples, CNN, 26 Feb. 2021 While some people choose to take a social media hiatus and delete apps, others might just unfriend people who have different political views. USA TODAY, 28 Jan. 2021 Ewell's alleged post, a screenshot of which was originally reported in The Virginian-Pilot newspaper, implored any Facebook friends who may have voted for Biden or are Democrats to unfriend him on the social media platform. Alec Snyder And Jonathan Kubiak, CNN, 17 Nov. 2020 See More Word History
First Known Use
2003, in the meaning defined above