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A face that betrays no sign of emotion.
straight′-faced′ (-fāst′) adj.
straight′-faced′ly (-fāst′lē, -fā′sĭd-lē) adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a serious facial expression, esp one that conceals the impulse to laugh
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an impassive facial expression that conceals one's true feelings, esp. a desire to laugh.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.