high-functioning

Short definition from Wiktionary

Adjective

1. 1
   Functioning or operating at a high level.
2. 2
   Of a person with a developmental or intellectual disability or mental illness, able to function in society; not greatly affected by a disability or illness.
3. 3
   Of a person with autism, exhibiting relatively high cognitive function.
4. 4
   Alternative spelling of high-functioning.