Thou doting thing, whose idle babbling tongue
But too well shows the plague of living long;
Hence, and reprove, with this your sage advice,
Your giddy daughter, or your awkward niece;
Know, I despise your counsel, and am still
A woman, ever wedded to my will;
a wanderer who has no established residence or visible means of support
Seven are my daughters, of a form divine,
With seven fair sons, an indefective line.
Go, fools! consider this; and ask the cause
From which my pride its strong presumption draws;
Consider this; and then prefer to me
Caeus the Titan's vagrant progeny;
"Spurious" also means "plausible but false"--this definition is suggested in Niobe's questioning of Latona's divinity ("What madness this, to court a Goddess, founded merely on report?"), but the example sentence is focused on the shameful circumstances surrounding Latona's pregnancy--no land would let Latona give birth there because they were all afraid of what Juno would do to them. Unlike Niobe's lawfully fathered children, Latona's twins were fathered by a cheating Zeus.
To whom, in travel, the whole spacious Earth
No room afforded for her spurious birth.
"Sinewy" also means "possessing physical strength and weight; rugged and powerful"--this could describe the young Damasichthon who was a young man and required two arrows shot by the god Phoebus to kill him.
But Damasichthon, by a double wound,
Beardless, and young, lay gasping on the ground.
Fix'd in his sinewy ham, the steely point
Stuck thro' his knee, and pierc'd the nervous joint:
In the example sentence, "foment" simply means "stir up"--because the object of his lust is his wife's virgin sister and a daughter of the king of Athens, Tereus would not want the public's opinion. Although he considers bribing Philomela, her attendants, and her governess or using the resources of his kingdom and going to war, in the end, he secretly rapes Philomela and then lies about it.
Tereus surveys her with a luscious eye,
And in his mind forestalls the blissful joy:
Her circling arms a scene of lust inspire,
And ev'ry kiss foments the raging fire.
characterized by unrest or disorder or insubordination
But when the cyphers, figur'd in each fold,
Her sister's melancholy story told
(Strange that she could!) with silence, she survey'd
The tragic piece, and without weeping read:
In such tumultuous haste her passions sprung,
They chok'd her voice, and quite disarm'd her tongue.
Although the modern definition of the word is focused on partying, in the example sentence's situation, Procne uses the religious celebration of Bacchus (god of wine and ecstasy) as an opportunity to dress in disguise, slip away from the palace, and retrieve her sister (whom her husband had raped and mutilated).
From thence, her sister snatching by the hand,
Mask'd like the ranting Bacchanalian band,
Within the limits of the court she drew