The opposite to Over-dramatic.

Someone who is under-dramatic is not easily surprised/impressed. They don't exaggerate or get excited.
"Kyle is so under-dramatic, i told her i was pregnant and she was just like 'cool talk to you later', "

"Yeah she is totally under-dramatic Sherly - congratulations btw - when were you going to tell me?!"
by BrainMaster June 3, 2014
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