also arm-chair, 1630s, from arm (n.1) + chair; adjective sense in reference to "criticism of matters in which the critic takes no active part" is from 1886. Another old name for it was elbow-chair (1650s).
1. The word " armchair " has connotations of comfort and relaxation.
2. She sank into an armchair and crossed her legs.
3. She was sitting in an armchair with blankets wrapped round her.
4. He was nodding off to sleep in an armchair.
5. He sat down in the armchair and turned on the radio.