WordWeb Online

1. Increasing in strength or intensity
   "It is visible light from the radiographic intensifying screens that exposes the radiographic film"

1. Increase in extent or intensity
   "The Allies intensified the bombing"
   - escalate, step up
    
2. Make more intense, stronger, or more marked
   "The efforts were intensified"; "Her rudeness intensified his dislike for her"
   - compound, heighten, deepen
    
3. Become more intense
   "The debate intensified"
   - deepen
    
4. Make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark

See also: aggravating, augmentative, deepening, enhancive, exacerbating, exasperating, heightening, intensification, intensifier, intensity, thickening

Type of: alter, change, increase, modify

Antonym: moderating