chiefly

adverb
UK /ˈtʃiːfli/
US /ˈtʃiːfli/

Mostly or mainly.

The sky was chiefly blue with just a few clouds.


OTHER MEANINGS

2. More than anything else; above all.

She is chiefly known for her kindness.

3. For the most part; generally.

The class is chiefly made up of beginners.

4. In the main; usually.

He chiefly works from home these days.