Historical clue formulations

• Opened one's mouth but didn't speak? — 2017-11-30
• Expressed boredom, in a way — 2014-12-16
• Showed boredom — 2008-11-10
• Opened wide — 2005-01-05
• Opened wide — 2001-04-11
• Displayed ennui — 1997-12-08