Here are some examples of how "expressionlessly" could be used:
* "She stared at him expressionlessly, her face a blank canvas."
* "He spoke expressionlessly, his voice flat and monotone."
* "The robot moved expressionlessly, its metallic face devoid of any emotion."
"Expressionlessly" can also be used to describe a situation or object that lacks any emotional impact. For example:
* "The news report was presented expressionlessly, devoid of any empathy for the victims."
* "The painting was expressionlessly abstract, lacking any clear subject or meaning."