addle, addled, addlepated, bedeviled, befogged, befuddled, bemused, bewildered, bushed(chiefly Australian), confounded, confused, dazed, distracted, dizzy, dopey(also dopy), fogged, mixed-up, muddleheaded, muzzy, punch-drunk, punchy, raddled, shell-shocked, silly, slaphappy, spaced-out(or spaced), spacey(also spacy), stunned, stupefied, zonked, zonked-out

senseless, unconscious

at sea, out of it

clearheaded

alert, conscious