i Register
In some senses, impair is marked as archaic, obsolete. Watch for register when choosing this word.
ADV
dramatically, gravely, greatly, seriously, severely, significantly, substantially
directly
Smoking directly impairs your ability to exercise without getting tired.
PHRASES
badly impaired
The accident badly impaired his ability to walk without assistance.
hearing/mentally/visually impaired
Many schools now have special resources to support visually impaired students in the classroom.