S: (adj) meaningless, nonmeaningful (having no meaning or direction or purpose) "a meaningless endeavor"; "a meaningless life"; "a verbose but meaningless explanation"
W: (n) forgetfulness [Related to: forgetful] (unawareness caused by neglectful or heedless failure to remember) "his forgetfulness increased as he grew older"
S: (adj) mindless, vacuous (devoid of intelligence or thought) "a vacuous mind"; "a vacant expression"