1.  straightforwardness(n = noun.attribute) downrightness - the quality of being direct and straightforward; "what some people take for rudeness is really straightforwardness"
is a kind of directness, straightness
Derived forms adjective straightforward₂, adjective straightforward₁, adjective straightforward₃

2.  straightforwardness(n = noun.attribute) singleness - without hypocrisy; "the singleness of his motives could not be questioned"
is a kind of sincerity
Derived form adjective straightforward₂