To intensify "lovable":
* Absolutely: Absolutely lovable
* Incredibly: Incredibly lovable
* Hugely: Hugely lovable
* Extremely: Extremely lovable
* Truly: Truly lovable
To express a lack of "lovable":
* Un: Unlovable
* Non: Non-lovable
To create a contrast:
* Despite: Despite being lovable
* Although: Although lovable
Other creative options:
* Super: Super-lovable
* Mega: Mega-lovable
* Ultra: Ultra-lovable
The best prefix will depend on the specific context and the meaning you want to convey.