That proves the existence of something without demonstrating a method of construction.(adjective)
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Use "nonconstructive" in a sentence
"However, there is one area where I've consistently felt that you have under represented your true feelings and it feels like your general input on the topic has been mostly nonconstructive."
"Of course, at other times, having nothing to say can feel uncomfortable, embarrassing and nonconstructive."
"The uncomfortable, nonconstructive experience of nothing of say is anything but easy, grounded or focused."