1 (loanword) humor

2 humorous

1 taciturn

2 uncommunicative

3 silent

1 in silence

2 not speaking

1 sense of humor

1 tacit understanding

2 mutual understanding

3 rapport

4 connected at a deep level with each other

5 (of team members) well coordinated

6 tight

1 habitually silent (idiom)

2 reticent

3 uncommunicative

1 Silence is golden. (idiom)

1 to devote oneself to a task in silence (idiom)

1 obscure and unknown (idiom); an outsider without any reputation

2 a nobody

3 an unknown quantity