The word "inconsolable" already incorporates the negative prefix "in-" to indicate a state of being unable to be consoled.
If you're looking to express different nuances of "inconsolable," you could consider using alternative phrasing:
* Extremely sorrowful: Emphasizing the intensity of the grief.
* Deeply distressed: Highlighting the emotional turmoil.
* Utterly heartbroken: Conveying the severity of the emotional wound.
* Despondent: Describing a state of complete loss of hope.
Ultimately, the best way to convey the intended meaning depends on the specific context.