An Etymological Dictionary of Astronomy and Astrophysics

Not easy to do or to understand; hard to deal with.

Etymology (EN): Back-formation from difficulty; L. difficilis. “hard,” from → dis- “not, away from” + facilis “easy to do,” from facere “to do,” → fact.

Etymology (PE): Došvâr, from Mid.Pers. dušwâr “difficult, disagreeable,” variant dušxwâr antonym of xwâr “easy; light; low; mean, abject;” with prefix duš- “ill, evil, bad,” → dys-.