Here are some legitimate synonyms, categorized by nuance:

Legal & Lawful:

• Legal
• Lawful
• Licit
• Statutory
• Authorized
• Permissible
• Allowable
• Admissible
• Constitutional
• Valid
• Warranted
• Rightful
• De jure
• Sanctioned
• Enforceable

Genuine & Authentic:

• Genuine
• Authentic
• Real
• True
• Bona fide
• Official
• Accredited
• Recognized
• Sound
• Veritable

Just & Fair:

• Just
• Fair
• Proper
• Appropriate
• Reasonable
• Sensible
• Well-founded
• Right
• Correct
• Acceptable

Informal:

• Legit
• Kosher
• On the level
• On the up and up
• Dinkum (Australian, New Zealand)

The best synonym to use will depend on the specific context of your writing.

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By Jerry Ramonyai