noun
insufficiency
in-suh-FISH-un-see/ˌɪnsəˈfɪʃənsi/
A lack of the amount, ability, or function needed.
The cord's insufficiency in length prevents it from reaching the socket.

Etymology
The Latin noun names the condition of being insufficient. The related adjective described people as unable or inadequate, and things as lacking what was required—both reflected in today's sense of a shortfall.
In context
And the court says, at least in so far as the insufficiency of the evidence claim goes, the conviction is solid. There was sufficient evidence
More examples
- The judge dismisses the case because of the insufficiency of evidence.
- Renal insufficiency reduces the kidneys' ability to filter waste.
- The storm exposes the insufficiency of the town's drainage system.
Forms
insufficiency · insufficiencies
insufficient adjective — Not enough to meet a need.
Similar words
- shortage
- Shortage usually means too little of a needed resource.
- deficiency
- Deficiency often identifies a specific missing nutrient, quality, or component.
- inadequacy
- Inadequacy emphasizes failure to meet a required standard.