deadening

the act of making something futile and useless (as by routine)

so lacking in interest as to cause mental weariness

• “a boring evening with uninteresting people”
• “the deadening effect of some routine tasks”
• “a dull play”
• “his competent but dull performance”
• “a ho-hum speaker who couldn”
• “;”
• “- Edmund Burke;”
• “;”
• “- Mark Twain;”
• “s dreams are dreadfully wearisome”