Unseldom

When Mr. Collins said any thing of which his wife might reasonably be ashamed, which certainly was not unseldom, she involuntarily turned her eye on Charlotte.

Source: wiktionary

For as was the land, such was the art of it while folk yet troubled themselves about such things; it strove little to impress people either by pomp or ingenuity: not unseldom it fell into commonplace, rarely it rose into majesty; yet was it never oppressive, never a slave’s nightmare or an insolent boast: and at its best it had an inventiveness, an individuality, that grander styles have never overpassed: […]

Source: wiktionary

Mulai Abdul Aziz was, at the time of his succession (1894), about twelve or thirteen years of age. He was a younger son of the late Sultan, for Islamic thrones do not necessarily descend by primogeniture. It is not unseldom a brother who succeeds, and at times even more distant relations.

Source: wiktionary