inconsistently

In uneven fashion

In a manner that lacks uniformity or steadiness.

Someone who behaves inconsistently acts one way at one time and differently at another: The rules were applied inconsistently across departments.

Data collected inconsistently can't be reliably compared.

The word often implies criticism—that consistency was expected but not delivered.

unreliably

undependably

In untrustworthy manner

waveringly · falteringly · haltingly · uncertainly · precariously · dubiously · questionably · shakily · changeably · inconstantly

erratically

unpredictably

Without foreseeable pattern

capriciously · fitfully · spasmodically · chaotically · unevenly · impulsively · jerkily · aimlessly · desultorily · whimsically

variably

unevenly

In irregular manner

divergently · patchily · differently · irregularly · asymmetrically · disproportionately · lopsidedly · unequally

intermittently

sporadically

At irregular intervals

on-and-off · discontinuously · fitfully · spasmodically · patchily · recurrently · alternately · staccato · brokenly · off-and-on

Opposites
regularity/steadiness

inconsistentlyconsistently

In an unchanging way

uniformly · steadily · regularly · constantly · invariably

reliability/dependability

inconsistentlydependably

Consistently, as expected

reliably · faithfully · unfailingly · without fail · like clockwork

logical coherence

inconsistentlycoherently

In connected, sensible manner

logically · harmoniously · congruently · compatibly · in accord

Family

inconsistent

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