'Solemn' in the Bible

It is a Sabbath of solemn rest to you, and you shall afflict your souls; it is a statute forever.

"'Six days shall work be done: but on the seventh day is a Sabbath of solemn rest, a holy convocation; you shall do no kind of work. It is a Sabbath to Yahweh in all your dwellings.

"Speak to the children of Israel, saying, 'In the seventh month, on the first day of the month, shall be a solemn rest to you, a memorial of blowing of trumpets, a holy convocation.

It shall be a Sabbath of solemn rest for you, and you shall deny yourselves. In the ninth day of the month at evening, from evening to evening, you shall keep your Sabbath."

Seven days you shall offer an offering made by fire to Yahweh. On the eighth day shall be a holy convocation to you; and you shall offer an offering made by fire to Yahweh. It is a solemn assembly; you shall do no regular work.

"'So on the fifteenth day of the seventh month, when you have gathered in the fruits of the land, you shall keep the feast of Yahweh seven days: on the first day shall be a solemn rest, and on the eighth day shall be a solemn rest.

but in the seventh year there shall be a Sabbath of solemn rest for the land, a Sabbath to Yahweh. You shall not sow your field or prune your vineyard.

What grows of itself in your harvest you shall not reap, and the grapes of your undressed vine you shall not gather. It shall be a year of solemn rest for the land.