Adjective

(en adjective)

Showing a lack of forethought or sense.

Having no sensible meaning or purpose.

An act of mindless violence.

* {{quote-news

, year=2012 , date=August 5 , author=Nathan Rabin , title=TV: Review: THE SIMPSONS (CLASSIC): “I Love Lisa” (season 4, episode 15; originally aired 02/11/1993) citation , page= , passage=“I Love Lisa” opens with one of my favorite underappreciated running jokes from The Simpsons : the passive-aggressive, quietly contentious relationship of radio jocks Bill and Marty, whose mindless happy talk regularly gives way to charged exchanges that betray the simmering resentment and disappointment perpetually lingering just under the surface of their relationship.}}

Heedless.

(of a thing done) Overly repetitive and unchallenging.

Lacking a mind.

Atheism alleges that mindless scientific forces control the universe.

Adjective

(en adjective)

Bereft of feeling or consciousness; deprived of sensation; unconscious; insensible.

The blow to his head rendered him senseless , he didn't awaken until he was in the ambulance.

Lacking meaning or purpose; without common sense; pointless; meaningless.

What a senseless waste of money.

Without consideration, awareness or sound judgement; unreasonable; unwise; stupid.

He took senseless risks, not even aware of the danger he was in.