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Naff
Offensive Potential
Be careful, calling something 'naff' can offend someone if it's about a personal choice. 
Not for Formal Use
'Naff' is casual and may seem disrespectful or unprofessional in formal or serious situations. 
British Pop Culture
'Naff' is often used in British pop culture and may not be well understood by those unfamiliar with UK media. 