undependably

In fickle fashion

In an unreliable or inconsistent manner—not to be counted on.

Someone who shows up undependably might arrive late, early, or not at all: The buses run undependably in winter.

The word emphasizes the frustration of unpredictability rather than complete failure.

erratic

erratically

In an inconsistent manner

irregularly · fitfully · intermittently · haphazardly · unevenly · variably · capriciously · randomly · patchily · discontinuously

questionable

dubiously

With uncertainty or distrust

questionably · shakily · precariously · tenuously · sketchily · inconclusively · tentatively · waveringly · unstably · riskily

treacherous

deceitfully

In a lying manner

deceptively · falsely · disloyally · unfaithfully · perfidiously · sneakily · duplicitously · unscrupulously · crookedly · slipperily

flaky

irresponsibly

Without due care

recklessly · negligently · thoughtlessly · impulsively · frivolously · whimsically · giddily · airily · heedlessly · sloppily

Opposites
reliability/consistency of action

undependablydependably

Consistently, as expected

reliably · consistently · steadfastly · faithfully · unfailingly

Family

undependable

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