When
Without warning and when are semantically related. In some cases you can use "Without warning" instead an adverb "When".
Without warning
When and without warning are semantically related. Sometimes you can use "When" instead an adverb phrase "Without warning".
Mutual synonyms
Cite this Source
Without warning and When. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/when/without_warning
When & Without warning. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/when/without_warning>.
Without warning or When. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/when/without_warning.
Google Ngram Viewer shows how "when" and "without warning" have occurred on timeline