According to a study published in Applied Cognitive Psychology , the answer is no.
In fact, complex writing makes you sound small-minded. Just consider the title of the study: Consequences of erudite vernacular utilized irrespective of necessity: problems with using long words needlessly.
Wouldn’t it be better to title this study something like The effect of using big words when you don’t need them?
To sound smart, you must stop trying to sound smart. Brilliant writing is simple writing, a relevant idea delivered clearly and directly.