Example : The tension heightened.

Synonyms : rise

Example : Heightened interest.

Example : This will enhance your enjoyment.
Heighten the tension.

Synonyms : enhance, raise

Example : The athletes kept jumping over the steadily heightened bars.

Example : This drug will sharpen your vision.

Synonyms : sharpen

Example : The efforts were intensified.
Her rudeness intensified his dislike for her.
Pot smokers claim it heightens their awareness.
This event only deepened my convictions.

Synonyms : compound, deepen, intensify