prudish; strait-laced; boring; square
tight-lipped; able to keep a secret
obstinate; inflexible; thickheaded
tight-lipped; able to keep a secret
thickheaded; obstinate; inflexible; stubborn
having one's guard up; not showing weak points; (of women) resisting attempts of being hit on; being distrustful of potential love interests; prudish
thickheaded; obstinate; inflexible; stubborn
tight-lipped; able to keep a secret
obstinate; inflexible; thickheaded
tight-lipped; able to keep a secret
let's put formalities aside; let's not speak so stiffly
let's put formalities aside; let's not speak so stiffly
serious topic (of conversation)
chaste woman; virtuous woman