chumminess

Ive always wondered at your chumminess with him, said Nelson slowly, reseating himself.

That is due to the chumminess or the affinity of iron with oxygen.

Her friendship with Lily Pendleton was not like the chumminess of other girls.

She took Miss Maxwell for a sleigh-ride, but they did not make much progress toward chumminess.

As her reception of Paul's sister was not conducive to chumminess, Paul did not bring Linda again.