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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
 
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