verb. Simple past tense and past participle of heighten.

adjective. increased in intensity or concentration; elevated, stepped-up

"COOPER: Thelma, if tens of thousands of people are going through, what exactly are customs agents doing during this -- what they call the heightened alert?"

brightened  enlightened  frightened  lightened  tightened  

accelerated  aggrandized  aggravated  amplified  annoyed  

heighten