He was a mature man, very social and begifted with a natural curiosity for everything alive.
Explanation:
A connotation is a commonly understood word that in addition to the its literal meaning, carries an underlying emotional or cultural association. If we take for example the words <em>old </em>and<em> mature </em>we associate the latter in a positive way, because we imagine someone experienced in life instead of just being old. <em>Social </em>has a positive connotation too, but <em>socialist </em>doesn´t; the former is more human and the latter is political. Another example is <em>nosy </em>and <em>curious: </em>The latter can mean eager to know and learn; the former is somebody who is too curious - specially concerning personal details.