1 not good enough, big enough, skilled enough etc for a particular purpose [≠ adequate]:
inadequate resources
inadequate for
The parking facilities are inadequate for a busy shopping centre.
totally/wholly/woefully/hopelessly etc inadequate
The building's electrical system was completely inadequate.
The new air conditioning system proved inadequate.
2 someone who feels inadequate thinks other people are better, more skilful, more intelligent etc than they are:
The teacher made us feel inadequate and stupid if we made mistakes.
inadequately adverb:
Colleges have been inadequately funded for years.

Dictionary results for "inadequate"
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