Synonyms of legitimately

adverbIn a legitimate manner, properly, fair and square.

• genuinelyIn a genuine manner; truthfully, truly.
• legallyAs permitted by law; not contrary to law.
• validlyIn a valid manner.
• above a bitGreatly, very much.
• actually
• all things consideredDespite possible indications to the contrary.
• as a matter of factActually, in fact.
• certainly
• come to think of itBy the way; now that I think about it; indicates something brought to mind.
• de factoIn actual use or existence, regardless of official or legal status.
• definitely
• de jureBy right; in accordance with or as deemed by the statute of the law, particularly as opposed to actual practice.
• fact isActually, in truth.
• franklyIn a frank or candid manner, especially in a way that may seem too open, excessively honest, or slightly blunt.
• honestlyFrankly, to be honest.
• in actualityIn fact; in truth.
• in all honestyHonestly; in truth.
• indubitablyIn a manner that leaves no possibility of doubt.
• in fact
• in point of factActually.
• in realityIn real life, as opposed to online, play, make believe, or theory.
• in truthTruthfully, to tell the truth, in fact.
• indeed
• literallyWith phrasings that might normally be used or understood as figurative: truly; not figuratively; not as an idiom or...
• not gonna lie
• properly
• really
• right
• simplyFrankly.
• surely
• to be frankSynonym of frankly.
• to be honest
• TBH
• to tell the truthAn attestation to the truthfulness and frankness of an associated statement.
• truly
• truthfully
• undoubtedlyWithout doubt; definitely.
• very muchWithout doubt; indeed.
• wis dialectal
• candidlyIn a candid manner; frankly.
• outright
• earnestlyIn an earnest manner; being very sincere; putting forth genuine effort.
• for realGenuinely, truly.
• for realsies slangTruly, genuinely, actually.
• forthcominglyIn a forthcoming manner.
• no capUsed to emphasize that one is telling the truth.
• openlyIn an open manner; visibly.
• sincerely
• singly
• straight up
• lawfullyConforming to the law; legally.
• licitlyIn a licit manner, legally, in a manner compatible with law.
• by right obsolete
• forsooth archaic, poeticUsed as an intensifier, often ironic: indeed, really, truthfully.
• in faith archaicReally, truly.
• soothfast obsoleteActually; truthfully.
• soothly archaicTruly, verily.
• verily archaic