00More optionsShareSaveReportVideo vocabularyNo vocabulary matches your filtersstuffUS /stʌf/・UK /stʌf/Uncountable NounGeneric description for things, materials, objectsTransitive VerbTo push material inside something, with forceB1More awesomeUS /ˈɔsəm/・UK /'ɔ:səm/AdjectiveGreat; wonderful; stupendousB2TOEICMore insaneUS /ɪnˈsen/・UK /ɪnˈseɪn/AdjectiveMentally ill; crazyBeing crazy or stupidB2More effectiveUS /ɪˈfɛktɪv/・UK /ɪˈfektɪv/AdjectiveWorking efficiently to produce a desired resultIn operation; in force.A1TOEICMore Use EnergyUnlock All VocabularyUnlock pronunciation, explanations, and filtersUnlock