adj ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Functioning or operating at a low level.
2. 2
   Of a person with a developmental or intellectual disability or mental illness, unable to function in society; greatly affected by a disability or illness.
3. 3
   Of a person with autism, exhibiting relatively low cognitive function.

Etymology

From low + functioning.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.