straightness

(noun) (of hair) lack of a tendency to curl.

(noun) freedom from crooks or curves or bends or angles.

(noun) trueness of course toward a goal. Synonyms: directness. Example: "Rivaling a hawk in directness of aim."

(noun) having honest intentions. Synonyms: good faith. Examples: "He acted in good faith." "Doubt was expressed as to the good faith of the immigrants."

(noun) a sexual attraction to (or sexual relations with) persons of the opposite sex. Synonyms: heterosexuality, heterosexualism.