Question: which fonts are most professional?
Answer: Calibri. Having replaced Times New Roman as the default Microsoft Word font, Calibri is an excellent option for a safe, universally readable sans-serif font. ... 
Cambria. This serif font is another Microsoft Word staple. ... 
Garamond. ... 
Didot. ... 
Georgia. ... 
Helvetica. ... 
Arial. ... 
Book Antiqua.