flickeringly

In trembling fashion

In a flickering manner—with unsteady, wavering light or motion that alternates rapidly between brightness and dimness, presence and absence: The candle burned flickeringly in the draft.

The adverb is rare, as writers typically restructure sentences to use the verb or adjective instead.

light

glimmering

Faintly and unsteadily luminous

candlelight · firelight · luminous · dim · shadows · moonlit · lanterns · torchlight · lamplight · dancing

intermittent

sporadic

Occurring irregularly, infrequently

sputtering · broken · fitful · erratic · irregular · uneven · unsteady · blinking · strobe · on-and-off

unstable

wavering

Showing unsteady resolve

shaky · trembling · quivering · teetering · precarious · tenuous · volatile · fleeting · ephemeral · transient

uncertain

hesitant

Slow to act

doubtful · ambivalent · vacillating · irresolute · faltering · questioning · unsure · equivocal · noncommittal · half-hearted

eerie

ghostly

Resembling a specter

phantasmal · supernatural · otherworldly · candlelit · séance · apparition · mysterious · ominous · unsettling · chilling

Opposites
stability of light/movement

flickeringlysteadily

In constant, unwavering fashion

constantly · steadfastly · unwavering · firmly · fixedly

intensity constancy

flickeringlyevenly

In equal parts

uniformly · continuously · smoothly · consistently · regularly

Phrases
Family

flickering, unflickering

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