adj. (followed by `to' or `of') lacking conscious awareness of; "oblivious of the mounting pressures for political reform"; "oblivious to the risks she ran"; "not unmindful of the heavy responsibility"

adj. showing a lack of attention or care; "inattentive students"; "an inattentive babysitter"

adj. not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead; "lay unconscious on the floor"

adj. happening by chance or unexpectedly or unintentionally ; "with an inadvertent gesture she swept the vase off the table"; "accidental poisoning"; "an accidental shooting"

adj. occurring or appearing or singled out by chance; "seek help from casual passers-by"; "a casual meeting"; "a chance occurrence"

adj. easily tricked because of being too trusting; "gullible tourists taken in by the shell game"

adj. not aware or knowing; "an unwitting subject in an experiment"

adj. engaged in or accustomed to close observation; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"

adj. aware or knowing; "a witting tool of the Communists"