somewhat formal
: not having or providing enough of what is needed : not sufficient
The case was thrown out because of insufficient evidence.
—often followed by to + verbThere was insufficient evidence to prove their case.
—often + forHis income was insufficient for the family's needs.
Cite this Entry
“Insufficient.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/insufficient. Accessed 15 Apr. 2026.
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