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

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