causelessly

Lacking any justification

Without cause or reason; in a manner lacking justification or motive.

The word appears in formal or literary contexts: He worried causelessly about disasters that never came.

Something done causelessly has no apparent explanation or provocation behind it.

arbitrary

randomly

Without deliberate selection

purposelessly · whimsically · capriciously · erratically · unpredictably · spontaneously · impulsively · unaccountably · inexplicably · unintentionally

unjustified

groundless

Lacking factual support

unsupported · unsubstantiated · unmerited · undeserved · indefensible · unjustifiable · inexcusable · unprovoked · gratuitous · unmotivated

irrational

senselessly

Without rational purpose

nonsensically · preposterously · mindlessly · foolishly · recklessly · madly · wildly · irrationally · incoherently · ridiculously

Opposites
justification/reason

causelesslyjustifiably

With valid grounds

reasonably · rightfully · legitimately · warrantedly · with good reason

causation

causelesslyconsequently

As a result

causally · as a result · by reason of · accordingly · thereby

Family

causeless

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G