legitimately
adverb
[ lɪˈdʒɪtɪmətli ]
• in a way that conforms to the law or to rules.
• "they can prove that the funds were acquired legitimately"
• in a way that can be defended with logic or justification; fairly.
• "nobody can legitimately argue that he didn't pay his dues"
• truly; genuinely.
• "there are tons of legitimately terrible movies"