It was an unspoken thing between them.
出自: E. FigesThe most important communication from a patient is unspoken.
出自: P. Casement"a mute appeal"
"a silent curse"
"best grief is tongueless"
"the words stopped at her lips unsounded"
"unspoken grief"
"choking exasperation and wordless shame"
"the unexpressed terms of the agreement"
"things left unsaid"
"some kind of unspoken agreement"
"his action is clear but his reason remains unstated"