of hair Lack of a tendency to curl.

Pools: prostość

Freedom from crooks or curves or bends or angles.

Trueness of course toward a goal.

synoniem: directness.

Roget 246: straightness, rectilinearity^†, directness; inflexibility etc. (stiffness) 323; straight line, right line, direct line; short cut.   

Nederlands: directheid

Having honest intentions.

synoniem: good faith.

Nederlands: goed vertrouwen

A sexual attraction to (or sexual relations with) persons of the opposite sex.

synoniemen: heterosexualism, heterosexuality.

Nederlands: heteroseksualiteit
Pools: heteroseksualizm, heteroseksualność