← DefinitionshareGuessdeficientadjectiveNot having enough of something that is needed or expected; lacking in quantity or quality.nounA person who is lacking in some ability, quality, or resource (often used in formal or technical contexts).SynonymsinsufficientadjectiveincompleteadjectiveinadequateadjectivelackingadjectiveAntonymssufficientadjectiveadequateadjective