Noun straightness has 5 senses
  1. straightness - of hair: lack of a tendency to curl
    --1 is a kind of
    curvature, curve
    Antonyms: curliness
  2. straightness - freedom from crooks or curves or bends or angles
    --2 is a kind of
    shape, form, configuration, contour, conformation
    Antonyms: crookedness
  3. directness, straightness - trueness of course toward a goal; "rivaling a hawk in directness of aim"
    --3 is a kind of characteristic
    --3 has particulars: downrightness, straightforwardness; immediacy, immediateness
  4. good faith, straightness - having honest intentions; "he acted in good faith"; "doubt was expressed as to the good faith of the immigrants"
    --4 is a kind of honesty, honestness
  5. heterosexuality, heterosexualism, straightness - a sexual attraction to (or sexual relations with) persons of the opposite sex
    --5 is a kind of sexual activity, sexual practice, sex, sex activity