inadequate
adj. · n.-
1 not enough in amount (adj.) B2 Upper Intermediatenot enough of something to meet a need.
insufficient in quantity or quality to satisfy a particular requirement or purpose.
ExampleThe food supplies were inadequate for the large number of people at the camp.
ExampleThe existing infrastructure proved woefully inadequate for the sudden influx of seasonal workers, leading to significant delays in local transport.
UsageOften used with the preposition 'for' to indicate the purpose being failed.
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2 not good enough (adj.) B2 Upper Intermediatelacking the quality or ability that is needed for a task.
failing to reach an expected or required standard of quality or competence.
ExampleHe felt inadequate in his new job because he didn't understand the software.
ExampleDespite her extensive experience, she felt strangely inadequate when asked to lead the international delegation through the complex legal negotiations.
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3 an incapable person (n.) C2 Proficiency Formala person who is not able to deal with the demands of life or a specific situation.
a person who lacks the necessary emotional or mental stability to cope with everyday life or social requirements.
ExampleThe novel describes a man who sees himself as a social inadequate.
ExampleThe report suggested that the facility was housing several social inadequates who required more intensive psychological support than the staff could provide.
UsageUsually functions as a countable noun, often in psychological or sociological contexts.
From in- + adequate.