Dictionary entry of ดุ

เธอว่าตัวเองไม่ใช่คนหยิ่งแต่เป็นคนหน้าดุและไม่ค่อยยิ้ม

Would this fly:

She criticizes herself and isn't arrogant, but she's got a stern look and never smiles.

I would render it "She says of herself that, while she is not arrogant, she has a forbidding look and does not smile."

Depending on context the sentence could describe something about her that she shinks of herself or something she actually tell people about herself.

เธอว่า could mean เธอคิดว่า (think)

She think she is not an arrogant person but has a stern look and seldom smiles.

เธอพูดว่า/เธอบอกว่า (say)

She says that she is not an arrogant person but has a stern look and seldom smiles.

ไม่ค่อย means "not often"

only ไม่ would mean "never"

Edited June 8, 201115 yr by Mole

She consider herself not an arrogant person, but she has a stern look and seldom smiles.