Like talking to a brick wall
By metaphor: Not a single person listened to his words. He spoke while they ignored his arguments.
(Modern Hebrew)
Translation
Expression (Hebrew)
דִּבֵּר אֶל הַקִּיר
Definition (Hebrew)
בְּהַשְׁאָלָה: אַף אֶחָד לֹא הִקְשִׁיב לִדְבָרָיו. הוּא דִּבֵּר תּוֹךְ שֶׁמִּתְעַלְּמִים מִטַּעֲנוֹתָיו.
(הָעִבְרִית הַחֲדָשָׁה)