Unstable Posted on 24th December 20153rd May 2021 by ThePD (The Project Definition) Unstable is likely to change or fail, not firmly established, not solid and firm and therefore not strong, safe, or likely to last. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in General and tagged word. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.