cognition:
intelligence.
dullness of mind:
intelligence,
Canniness,
shrewdness,
wisdom,
sense,
acumen,
judgment.
stupid act:
seriousness.
noun:
capacity,
rationality,
horse sense,
brilliance,
logicality,
quickness,
reasonableness,
brightness,
brilliancy,
sense,
prudence,
cleverness,
reasonability,
sharpness,
readiness,
soundness,
alertness,
keenness,
forethought,
common sense,
Percipience,
sensibility,
perception,
discretion,
acuteness,
levelheadedness,
discernment,
inspiration,
animation,
perspicacity,
brainstorm,
insight,
logicalness,
judgment,
validity,
Sageness,
sapience,
smartness,
braininess,
wit,
sensibleness,
quick-wittedness,
rationalness,
astuteness.