possibly

/ˈpɑ.sɪ.bli/
adverb

Perhaps; indicates that the proposition may be true (is not certainly false) regardless of any facts or circumstances known to, stated by or implied by the speaker.

NWL Collins ENABLE

Adverb 2 meanings

  1. Perhaps; indicates that the proposition may be true (is not certainly false) regardless of any facts or circumstances known to, stated by or implied by the speaker.

    “Near-synonyms: maybe, perhaps, mayhap, mayhaps, by chance, perchance, peradventure; conceivably”

  2. In the realm of possibility; indicates that the action may successfully be performed (is not impossible) regardless of any facts or circumstances known to, stated by or implied by the speaker that might limit the performance.

    “I'm much stronger than you, so you can't possibly win.”

Definitions: Wiktionary (CC BY-SA) via Kaikki/Wiktextract

Where it comes from

Etymology

From possible + -ly.

Similar and opposite words

Similar
potentiallymaybeperhapsmayhapmayhapsperchanceperadventureconceivably
Opposite
impossiblyinevitablycertainlyindubitablyundoubtablyundoubtedly

POSSIBLY at a glance

POSSIBLY has 8 letters and scores 15 points in Scrabble (P 3 + O 1 + S 1 + S 1 + I 1 + B 3 + L 1 + Y 4) and 17 in Words With Friends, before board bonuses. It ranks #1,724 by how often it appears in everyday English. It is valid in ENABLE, NWL2023, Collins/SOWPODS.

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