"Unspoken tension" refers to a feeling of discomfort or awkwardness between people that exists without being openly acknowledged or discussed. Full definition
There is a sensuality to most every scene, though those same scenes are filled with unspoken tension. (moviereviewsfromthedark.com)
Refn's direction in Drive's early scenes is all smooth glides and stops, unspoken tensions intimating the disfiguring jolts of panic and violence to come. (theartsdesk.com)
Written by Steven Knight and directed by John Crowley, the characters seem smart, and interactions between characters reveal interesting ideas as well as unspoken tensions. (combustiblecelluloid.com)