Hard-core: very strongly; a hard-core loyalist in marketing is a customer who believes very strongly that a specific product is good and always buys that same product.  523

Ostracism: not being included because others do not want to accept you or do not like you. 532

Rapid-fire: very quickly, one after another. The expression comes from the very fast firing of one bullet after another in an automatic gun.  544

Relationships: a connection between people that continues for a long time in the future. Relationships happen when people communicate and interact with each other.  514