General positivity:
* Eu-: From Greek, meaning "good" or "well". Examples: euphemism, eulogy, euphoria.
* Bene-: From Latin, meaning "good" or "well". Examples: benevolent, benefactor, benefit.
* Bon-: From French, meaning "good". Examples: bon voyage, bon appétit, bon vivant.
Other related prefixes:
* Pro-: Meaning "for" or "in favor of". While not directly meaning "good", it implies a positive attitude towards something.
* Super-: Meaning "above" or "beyond", often implying something better or greater.
* Ultra-: Similar to "super", indicating something exceeding the norm, often implying a positive attribute.
Important note: While these prefixes can suggest positive connotations, their meaning is often context-dependent. It's important to consider the specific word and its overall meaning.