orgiastic       
adjective  formal uk/ˌɔː.dʒiˈæs.tɪk/ us/ˌɔːr.dʒiˈæs.tɪk/
 放纵的,无节制的;放荡的
An orgiastic activity involves wild, uncontrolled behaviour and feelings of great pleasure and excitement.
 Synonym: bacchanalian 
 
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