having no meaning or direction or purpose
"a meaningless endeavor"
"a meaningless life"
"a verbose but meaningless explanation"
producing no result or effect
"a futile effort"
"the therapy was ineffectual"
"an otiose undertaking"
"an unavailing attempt"
Lacking meaning.
"The endless scrolling through social media felt completely meaningless as I stared at my phone for hours without reading a single post."