subnormal
sub·nor·mal
noun
1.
a person of less than normal intelligence
adjective
Origin
From sub- + normal.
Related words
Word family
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.