What is the meaning of Armchair?

A chair with supports for the arms or elbows.

An upholstered chair without armrests intended for the living room

A position removed from that which one is

Remote from actual involvement (including cases where a person has retired from previously active involvement).

Unqualified or uninformed but yet giving advice, especially on technical issues, such as law, architecture, medicine, military theory, or sports; relating to such advice.

To create based on theory or general knowledge rather than data.

To theorize based on analysis of data that was gathered previously; to reflect.

Source: wiktionary.org