unreasoningly

Lacking rational thought

In a manner not guided by reason or rational thought.

Someone who acts unreasoningly follows impulse, emotion, or instinct rather than logic: She unreasoningly feared the dark, even as an adult.

The word emphasizes the absence of deliberation—not necessarily foolishness, but a bypassing of analytical thinking.

uncritical

blindly

Without seeing or considering

uncritically · mechanically · automatically · robotically · mindlessly · passively · obediently · submissively · credulously · naively

impulsive

rashly

Without careful thought

precipitately · headlong · incautiously · thoughtlessly · carelessly · unthinkingly · spontaneously · abruptly · suddenly · wildly

instinctive

intuitively

By innate understanding

reflexively · automatically · involuntarily · unconsciously · animalistic · inherently · naturally · instinctually · unthinkingly · reactively

irrational

illogical

Contrary to valid reasoning

baseless · unfounded · unjustifiable · incoherent · fallacious · preposterous · ludicrous · foolish · groundless · unsound

obstinate

stubbornly

With inflexible determination

mulishly · pigheadedly · bullheadedly · obdurately · willfully · headstrongly · unyieldingly · intransigently · unbendingly · immovably

Opposites
rational process

unreasoninglyrationally

In a logical manner

reasonably · logically · analytically · sensibly · thoughtfully

emotional vs. intellectual basis

unreasoninglydispassionately

Without emotional involvement

unemotionally · objectively · impartially · detachedly · coolly

Family

unreasoning

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