What does "directness" mean?

The state or quality of being direct.

Directness

Common synonyms include: candor, frankness, appropriateness, artlessness, assertive style, atticism.

noun

noun ·3 syllables ·Moderate ·High school level

Noun

1
The state or quality of being direct. uncountable, usually
2
the quality of being honest and straightforward in attitude and speech wordnet
3
trueness of course toward a goal wordnet

"He was the ever-living Somali poet whose poetry addressed themes of love, kindness, national solidarity and uncompromising directness."

From direct + -ness.