Meanings
verbmust not (third-person singular simple present must not, no present participle, no simple past or past participle)
alternative mustn't
- no pastno present participleparticiplepastUsed to indicate that something is forbidden.
Pedestrians must not cross the road until the light goes green.
Synonyms: must refrain from, be not to
Synonyms & antonyms
verbUsed to indicate that something is forbidden.
Similar
must refrain frombe not to
Translations
Czech nesmět
- nesmětmust refrain from
Esperanto devi ne
- devi nemust refrain from
French devoir ne pas
- devoir ne pasmust refrain from
Welsh bod rhaid i ... beidio â, gorfod peidio â
- bod rhaid i ... beidio âmust refrain from
- gorfod peidio âmust refrain from
Cite this entry
APA
must not. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/must%20not
MLA
“must not.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/must%20not. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “must not,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/must%20not.
Source: must not on Wiktionary, CC BY-SA 4.0.