
Covet started out meaning the bad kind of wanting and only picked up a good sense a century later, while lust went the other way. Wanderlust is the one of these six I'd happily own up to, since it borrowed the milder German Lust.
Covet came into English in the mid-1200s already meaning the bad kind of wanting. Etymonline's earliest sense is to desire something "inordinately or without regard for the rights of others," from Old French coveitier and probably, further back, Latin cupiditas, and the respectable sense, wanting eagerly to have something, only turns up about a century later. Lust went the other way. In Old English it covered desire, appetite and plain pleasure, and the sense of sinful desire grew out of Bible translations, where "lusts of the flesh" rendered the Latin concupiscentia carnis. Its relatives in the other Germanic languages tend to mean simply pleasure, so wanderlust, borrowed from German in 1902, brought something like the older word back into English. Crave drifted too, more quietly. Old English crafian meant to ask for or demand something by right, and it reached the longing sense around 1400, probably by way of asking very earnestly. Yearn and esurient have stayed closer to home: one goes back to an Old English verb for being eager, a cousin of German gern, gladly, and the other was borrowed in the 1670s from the Latin for being hungry, esurire, which is built on edere, to eat. Megrim is the odd one. It's a worn-down form of migraine, which came through French and Late Latin from Greek hēmikrania, half the skull, and along the way it also picked up the senses low spirits and a whim or fancy. Etymonline says the word now seems obsolete or archaic even in those senses, which is a pity, because I can't think of a better name for wanting something badly at four in the afternoon and not at all by dinner.