IPA: /ˈteɪstfəli/
KK: /ˈteɪstfəlɪ/
In a way that shows good taste or judgment, especially in style or design.
The room was decorated tastefully, with elegant furniture and soft colors.
Tastefully → It is formed from "taste" (from Old French *taster*, meaning to perceive flavor) and "-fully" (meaning in a manner full of). The word "tastefully" means in a manner full of taste or aesthetic appreciation.
Think of 'taste' as perceiving flavor and remember that 'tastefully' means doing something in a way that shows good taste or aesthetic appreciation.