high-functioning

adjective3

1. •
   Functioning or operating at a high level.

   • The high-functioning therapists were found to have a greater tendency to confront patients and, when they did so, confronted them with their resources. — 1978
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.

   • A unit wide behavioral programming system for high functioning mentally retarded clients who displayed maladaptive behavioral excesses... — 1986
3. •
   Of a person with autism, exhibiting relatively high cognitive function.