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The problem is people confuse "unstable" with "agile" and "stable" with "sluggish" because the terms stable/unstable have very specific, prescribed meanings that aren't necessarily in line with the common vernacular.
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Yes, terminology is very important. Take the "maximum lift coefficient" term. That is often used to define the highest Coefficient of Lift over a given range.
http://www.google.com/search?q=Cruis...w=1920&bih=941
http://enpub.fulton.asu.edu/aero/mae...ingchapter.pdf
"Maximum coefficient of lift" is the term for the CLmax a section can produce and defines the Angle of Attack the airfoil stalls.
http://www.google.com/search?q=Cruis...0&bih=941&bs=1