Dictionary.com
Thesaurus.com
Synonyms

inadequate

American  
[in-ad-i-kwit] / ɪnˈæd ɪ kwɪt /

adjective

  1. not good enough for the purpose; inept or unsuitable.

    This old tent they gave us is completely inadequate—it’s equally bad at keeping out both the rain and the bugs!

    Synonyms:
    imperfect, defective, incommensurate, incompetent, inapt, incomplete
    Antonyms:
    sufficient
  2. not sufficient for the purpose; not enough.

    The set of linens we received was so inadequate, we were asking friends for a loan of napkins and tablecloths.

  3. Psychiatry. ineffectual in response to emotional, social, intellectual, and physical demands in the absence of any obvious mental or physical deficiency.


inadequate British  
/ ɪnˈædɪkwɪt /

adjective

  1. not adequate; insufficient

  2. not capable or competent; lacking

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • inadequacy noun
  • inadequately adverb

Etymology

Origin of inadequate

First recorded in 1665–75; in- 3 + adequate

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

People use social media to keep up with their friends and family, but teens can also feel inadequate, sad or anxious when they compare themselves to a curated version of other people’s lives online.

From Los Angeles Times • Mar. 28, 2026

But in February, a group of seven medical organisations said this would mean "inadequate scrutiny."

From BBC • Mar. 16, 2026

Tenenbaum, of IFRI, said European capabilities were superior to that of the United States, but still "totally inadequate to confront this threat today".

From Barron's • Mar. 11, 2026

Her attorneys allege that the arrest was retaliation for news coverage and that she was improperly detained with an inadequate warrant.

From The Wall Street Journal • Mar. 9, 2026

Were you more aware, you would know or realize by now that the offending trousers were dispatched to you with our full knowledge that they were inadequate so far as length was concerned.

From "A Confederacy of Dunces" by John Kennedy Toole