unreplying
/ɪnˈrɪplaɪɪŋ/Definitions
1. verb
engaging in unresponsive or uncommunicative behavior, especially in response to messages or attempts to communicate
“Her unreplying to his messages created a rift in their friendship.”
2. adjective
unwilling or refusing to respond or communicate
“The unreplying nature of the customer service representative was frustrating.”