reasonless
1. [ adjective ] not endowed with the capacity to reason
Examples:

"a reasonless brute"

Related terms: irrational
2. [ adjective ] not marked by the use of reason
Synonyms: senseless mindless
Examples:

"mindless violence" "reasonless hostility" "a senseless act"

Related terms: unreasonable
3. [ adjective ] having no justifying cause or reason
Synonyms: causeless
Examples:

"a senseless, causeless murder" "a causeless war that never had an aim" "an apparently arbitrary and reasonless change"

Related terms: unmotivated
Similar spelling:   regionalism
  regional
  resinlike
  regionally