'Charred' in the Bible

For my days are vanishing like smoke; my bones are charred as in a fireplace.

After all, it's useful only for kindling a fire, isn't it? And once you've burnt up the ends and charred through the middle of it, is it useful for anything else?

If it was useless before it was burned, now that it's been burned and charred through, it's even more useless!