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2.
A word mistaken used by people, where they actually mean observant.
"You aren't very observative"
"You mean I'm not very observant"
by HunkeyMonkey February 24, 2013
 
1.
To watch carefully especially with attention to details or behavior; pobserve], observant, observative
Wow, Mike that was really observative.
by Ada February 24, 2004