untheatrical

Adjective

Meaning

not suited to or characteristic of the stage or theater

Source: WordNet

natural real true controlled genuine modest authentic calm ineffective straightforward casual honest unaffected humble sincere

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theatrical chichi affected assumed comic camp

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a well-written but untheatrical play Source: Internet

an untheatrical personality Source: Internet

unthawed unthawing untheatric untheatricality untheatricalized untheatrically