omnisciently

With total awareness

In a manner suggesting complete or infinite knowledge.

The adverb typically describes narration that reveals characters' inner thoughts and motivations: The novel is told omnisciently, moving freely between perspectives.

It can also describe someone acting as if they know everything: She smiled omnisciently, as though she'd predicted exactly this outcome.

knowing

all-knowing

Having complete awareness

totality · comprehensively · exhaustively · universally · completely · thoroughly · encyclopedically · authoritatively · definitively · certainly

prescient

prophetically

With accurate foresight

sibylline · augural · predictively · anticipatorily · portentously

divine

god-like

Resembling a deity

omnipotent · omnipresent · transcendent · celestial · sacred · holy · sovereign · creator · heavenly · providentially

perceptive

perspicaciously

With keen discernment

shrewdly · insightfully · intuitively · penetratingly · acutely · keenly · observantly · piercingly · incisively · knowingly

Opposites
extent of knowledge

omniscientlyignorantly

Without knowledge or awareness

unknowingly · cluelessly · obliviously · naively · unwittingly

awareness/consciousness

omniscientlyunawares

Without prior knowledge

unawarely · obliviously · blindly · unconsciously · unseeing

certainty/confidence in knowledge

omniscientlyuncertainly

In a doubtful way

doubtfully · tentatively · hesitatingly · gropingly · fumblingly

Phrases
Family

omniscient

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