reasonless
Lacking any basis
Reasonless means without reason or cause.
A reasonless fear has no rational basis.
Reasonless anger erupts without provocation.
The word is uncommon and somewhat literary, appearing where *irrational* or *groundless* might serve in everyday speech: The accusation seemed reasonless, born of spite rather than evidence.
Subject to sudden changes
- randomOccurring without pattern
- haphazardLacking organization or plan
- groundlessLacking factual support
- baselessLacking factual support
unjustified · unwarranted · unfounded · indiscriminate · unmotivated · unprovoked · gratuitous · purposeless
Lacking sound judgment
- nonsensicalWithout coherent meaning
- absurdWildly illogical
- fallaciousContaining faulty reasoning
- incoherentLacking logical connection
unsound · contradictory · paradoxical · preposterous · specious · invalid · flawed · incongruent
Arising without external cause
- unplannedNot arranged beforehand
- instinctiveArising without conscious thought
- impetuousActing on sudden urge
- recklessCarelessly ignoring danger
hasty · rash · unpremeditated · abrupt · sudden · uncontrolled · heedless · involuntary
capricious
Subject to sudden changes
- randomOccurring without pattern
- haphazardLacking organization or plan
- groundlessLacking factual support
baseless · unjustified · unwarranted · unfounded · indiscriminate · unmotivated · unprovoked · gratuitous · purposeless · pointless
irrational
Lacking sound judgment
- nonsensicalWithout coherent meaning
- absurdWildly illogical
- fallaciousContaining faulty reasoning
incoherent · unsound · contradictory · paradoxical · preposterous · specious · invalid · flawed · incongruent · unreasoned
spontaneous
Arising without external cause
- unplannedNot arranged beforehand
- instinctiveArising without conscious thought
- impetuousActing on sudden urge
reckless · hasty · rash · unpremeditated · abrupt · sudden · uncontrolled · heedless · involuntary · knee-jerk
reasonlessreasonable
Showing sound judgment
rational · sensible · logical · well-founded · justified
reasonlessmotivated
Spurred to action
purposeful · caused · driven · intentional · purposive
reasonlessmotivated
Spurred to action
purposeful · deliberate · intentional · driven · goal-oriented
reason, reasoning, reasonable, unreasonable, reasoned, unreasonably, unreasonableness, unreasoning, unreason