"[Is "glitteringly" a word?]"
It is now! :)
Will you really keep the Precious safe? [looks suspiciously, then looks down at the Ring which shines glitteringly. . .] Promise not to ruin it by cooking it like Hobbit ruins nice fresh fissssssh? Nasty taters. . .
"Promise not to ruin it by cooking it like Hobbit ruins nice fresh fissssssh? Nasty taters. . ."
Fish and taters can't make me ruin it...it SHINESSSSSSSSSSSS, Precioussss!