Synonyms & related words for deficient

Find synonyms, related words, and the definition of deficient — including insufficient, inadequate, lacking, inferior, defective, flawed. Dendril is a free visual thesaurus that shows them on an interactive map where stronger matches sit closer to the center — no signup, no ads.

Words related to deficient

Explore words related to deficient — words associated with it, words that go with it, and its nearest matches in meaning. Related words include substandard, deficiency, inadequateness, insufficiency, inadequacy, lacks, adequate, nonfunctional. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for deficient

Common synonyms for deficient include insufficient, inadequate, lacking, inferior, defective, flawed, faulty, failing — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.

Where does deficient come from?

The word deficient breaks down into one root of Latin origin: the root fic-, from Latin facio (“make, do”). Explore each root to see other English words built from the same source.