Verb

to awaken [ awakened ; awakened ]
to stimulate [ stimulated ; stimulated ]
to alert [ alerted ; alerted ]
to perceive [ perceived ; perceived ]
to remind [ reminded ; reminded ]
to warn [ warned ; warned ]
to jog

Noun

acumen [pl. acumens]
discernment [pl. discernments]
sagacity [pl. sagacities]
shrewdness [pl. shrewdnesses]

Adjektive

clever [ more clever ; most clever]
shrewd [ shrewder ; shrewdest]