Using data gathered via a web-based survey, the inquiry explores the relationship between preferences for (in)formal language and attitudes toward linguistic variation amid a large group of monolingual and multilingual adults (n = 379). Also examined are the links between preferences for (in)formal language and several secondary variables: tolerance of ambiguity, degree of multilingualism, age, experience living abroad, and educational achievement. Participants with more favourable attitudes toward linguistic practices that differ from standard usage, who were more tolerant of ambiguity, and who had spent at least some time living or working in a foreign country tended to have more informal linguistic preferences. Formality preferences did not, however, appear to be linked to knowledge of multiple languages, age, or education. Extending the findings reported in a former study [van Compernolle, R. A. (2016). Are multilingualism, tolerance of ambiguity, and attitudes toward linguistic variation related? International Journal of Multilingualism, 13, 61–73], the debate focuses on a multidirectional relationship between the variables of interest, including the mutual influence of language attitudes and formality preferences. Future directions are presented in the conclusion.