Definition from macmillandictionary.com
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The pain was intense.
He’s been under intense pressure.
an intense, vibrant red
Festivities began in the intense heat of the midday sun.
an intense stare
This type of work requires intense concentration.
Some people find her hard to get along with because she’s so intense.
an intense person/personality/nature
He seemed to dislike me intensely.
an intensely irritating young man
the intensely competitive world of industry