gloat
Concise Oxford English Dictionary © 2008 Oxford University Press:
gloat/ɡləʊt/
▶verb contemplate one's own success or another's misfortune with smugness or malignant pleasure. ▶noun an act of gloating.
– derivatives
gloater noun,
gloating adjective & noun,
gloatingly adverb.
gloater noun,
gloating adjective & noun,
gloatingly adverb.
– origin C16 (in the sense ‘give a sideways or furtive look’): of uncertain origin; perh. rel. to ON glotta ‘to grin’ and Mid. High Ger. glotzen ‘to stare’.
'gloat' also found in these Oxford entries:

