noun, na-adjective, noun which may take the genitive case particle 'no'
with an open and calm mind; without preconceptions; candidly
A yojijukugo describing a mental state free from bias, prejudice, or emotional disturbance; used when approaching a situation or person with complete openness and honesty.
He accepted the proposal with an open and calm mind.
It is important to approach the discussion with an unprejudiced attitude.