gtk3 themes

I have problem with setting Bold font in
.config/gtk-3.0/settings.ini

i am a big fan of Terminus font but cannot get bold to work
i use dwm so settings from xfce4 do not work

Code:cat /home/przemo/.config/gtk-3.0/settings.ini
[Settings]
gtk-theme-name= Xface-flat
gtk-icon-theme-name= Adwaita
gtk-font-name= Terminus Bold 10
gtk-cursor-theme-name= Adwaita
gtk-cursor-theme-size= 0
gtk-toolbar-style= GTK_TOOLBAR_BOTH
gtk-toolbar-icon-size= GTK_ICON_SIZE_LARGE_TOOLBAR
gtk-button-images= 1
gtk-menu-images= 1
gtk-enable-event-sounds= 1
gtk-enable-input-feedback-sounds= 1
gtk-xft-antialias= 1
gtk-xft-hinting= 1
gtk-xft-hintstyle= hintfull
gtk-xft-rgba= rgb