intelligence
the mind
genius
a genius , geniuses
a gift
cleverness
insight
wisdom
common sense
ability = capability = capacity
competence
lucidity
a skill
consciousness
intelligent / bright
clever / smart
brilliant
quick-witted
gifted
cunning
sharp
shrewd
ski(l)lful
competent // incompetent
able ( to do something) = capable ( of doing something)
careful = attentive
conscious, aware // unconscious, unaware
understandable
reasonable
wise // unwise
stupidity
silliness, foolishness
idiocy
an idiot, a fool
a nitwit, a halfwit
stupid
silly, foolish
dumb, dim
backward, mentally-retarded
simple-minded
memory
a memory, a recollection
a keepsake
a reminder
oblivion
amnesia
unforgettable
to remember, to recall, to recollect
to forget
imagination
fancy
inventiveness
an impression
an illusion
a delusion
a dream
a daydream
a nightmare
a foreboding
a misgiving
an omen
an intuition, a hunch
imaginary
foreseeable, predictable
to imagine
to fancy
to invent
to guess
to delude oneself
to dream
to muse
to foresee
to predict, to forecast, to foertell
to sense
sanity and insanity
a nervous breakdown
a hang-up / a complex
eccentricity
absurdity, nonsense
delirium
madness
a madman, a lunatic
a maniac
a lunatic asylum, a madhouse
a strai(gh)tjacket
eccentric
mixed-up
crazy, mad, insane
delirious
i have a feeling, the impression that
to be under the impression that
she's got a high IQ
he's a computer whizz
it makes sense
i'm well aware that
he has got a short attention span
a lapse of memory
from memory
he reminds me of his father
we must hear / keep in mind that
i'll refresh his memory
stop being so stupid
you must be out of your mind / you can't be in your right mind
he lost his head / mind
come to your senses
what a morron
his worse nightmare came true
he drives me mad
don't get mad
sane
sober
hysterics
sensible