1. not suited to or characteristic of the stage or theater; - Example: "a well-written but untheatrical play" - Example: "an untheatrical personality"
WordNet (r) 3.0 (2006):
untheatrical
adj 1: not suited to or characteristic of the stage or theater;
"a well-written but untheatrical play"; "an untheatrical
personality" [ant: theatrical]