adiaphoron /a-di-afˈə-ron/ (theology and ethics)

1. A matter of indifference, which is neither approved nor disapproved in the religion or ethical system
2. Any tenet or usage considered non-essential

adiaphˈorism noun

1. Tolerance or indifference in regard to non-essential points in theology
2. Latitudinarianism

• have a good head on one's shoulders
• have a good mind
• have a good thing going
• have a good time
• have a great mind
• have a head like a sieve
• have a heart
• have a job to
• have all one's buttons
• have all one's buttons on
• have all one's eggs in one basket
• have all the answers
• have a load on
• have a memory like a sieve
• have a mind of one's own
• have a monkey on one's back
• have an early night
• have an edge against
• have an edge on
• have an edge over
• have an eye to
• have an eye to the main chance
• have an itching palm
• have an oar in another's boat
• have another think coming