inadequateness

Not being enough

The quality or state of being inadequate—falling short of what is needed or expected.

Inadequateness emphasizes the condition itself rather than a specific instance: The inadequateness of the response became clear over time.

The more common form is inadequacy, which serves the same purpose with less awkwardness.

deficiency

insufficiency

Shortfall in amount needed

shortage · lack · want · deficit · incompleteness · meagerness · sparseness · undersupply · privation · bareness

imperfection

flaw

Imperfection in something

limitation · drawback · failing · shortcoming · blemish · gap · omission · deficiency · handicap · incompleteness

unfitness

incompetence

Lack of required skill

unsuitability · ineffectiveness · inefficiency · amateurishness · inexperience · clumsiness · helplessness · powerlessness · inability · ineptitude

Opposites
sufficiency

inadequatenessadequacy

Being barely acceptable

sufficiency · adequateness · satisfactoriness · acceptability · suitability

abundance

inadequatenesssufficiency

State of being enough

adequacy · adequateness · abundance · plenty · enough

capability

inadequatenesscompetence

Adequate ability to function

capability · aptness · proficiency · qualification · fitness

Family

equal, equality, equity, adequate, equation, inequality, inadequate, equate, inadequacy

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Used worldwide · Timeless · Abstract · Negative · Everyday, not technical · Rated G