← BackshareGuessuncustomary/ʌnˈkʌstəˌmɛri/adjectiveNot according to usual practice or habit; unusual.The company made an uncustomary donation to the local charity.It was uncustomary for her to speak so loudly in public.Taking a vacation in the middle of the project was uncustomary for the team.SynonymsunusualabnormalAntonymscustomary