Having a face not revealing excessive emotion.(adjective)
Boldly, openly.(adjective)
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Use "straight-faced" in a sentence
"Not one to put all my eggs in one proverbial basket, I always keep my American passport, along with credit cards and my American bank card in another location – however, my Azeri bank card, along with my Azeri passport, about 30 manat ($45) and 4 straight-faced passport photos of me were in there."
"Politics being politics, none of that history stopped Mr. Obama from suggesting, straight-faced, that Mr. Emanuel and Mr. Dean had worked together in 2006, as he offered his tribute to the outgoing chairman."
"Whatever Borg repressed in all those years of straight-faced, emotionless tennis, he's thrown on these wildly-patterned, sunglass-requiring briefs."