From Wiktionary, the free dictionary
From un- + druggable.
undruggable (not comparable)
- Not druggable.
2007 March, Joanna Owens, “Determining druggability”, in Nature Reviews Drug Discovery[1], volume 6, number 3, →DOI, →ISSN, pages 187–187:However, there were five known druggable targets that had scored in the 'undruggable' target range.