1. So lacking in interest as to cause mental weariness
   "the deadening effect of some routine tasks";
   - boring, dull, ho-hum [informal], irksome, slow, tedious, tiresome, wearisome, unamusing, deadly [informal], draggy [informal], mind-numbing

1. The act of making something futile and useless (as by routine)
   "The deadening of creativity in the workplace led to a decline in innovation";
   - stultification, constipation, impairment

1. Make less lively, intense, or vigorous; impair in vigour, force, activity, or sensation
   "deaden a sound";
   - blunt
    
2. Become lifeless, less lively, intense, or active; lose life, force, or vigour
   "The conversation deadened as the night wore on"
    
3. Lessen the momentum or velocity of
   "deaden a ship's headway"
    
4. Make vapid or deprive of spirit
   "deadened wine"
    
5. Make vague, obscure or make (an image) less visible
   "They deadened the sound in the recording studio";
   - dampen, damp
    
6. Cut a girdle around so as to kill by interrupting the circulation of water and nutrients
   "The forester deadened the diseased trees";
   - girdle
    
7. (chemistry) convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil
   "The chemist deadened the mercury to make it safer to handle"

Derived forms: deadenings

See also: lame, lameo [informal], meh [informal], samey [Brit, informal], uninspiring, uninteresting

Type of: alter, break, change, convert, damp, dampen, debasement, degradation, incise, modify, retard, soften, weaken