1785. Grose, Vulg. Tongue, s.v.
Glum, adj. (old: now recognised).—Sullen; down in the mouth; stern. Fr.: faire son nez = to look glum; also, n’en pas mener large.
1712. Arbuthnot, Hist. of John Bull, pt. IV., ch. vii. Nic. looked sour and glum, and would not open his mouth.
1785. Grose, Vulg. Tongue, s.v.
17(?). Broadside Ballad, ‘Sam Hall, The parson he will come, And he’ll look so bloody glum.’
1816. Johnson, Dict. of the English Language. Glum, s.v., a low cant word formed by corrupting ‘gloom.’
1847. Thackeray, Vanity Fair, ii., ch. vi. ‘I wonder whether Lady Southdown will go away; she looked very glum upon Mrs. Rawdon,’ the other said.
1888. Referee, 21 Oct. Who found him looking glum and gray, And thought his accent gruff and foreign.
1892. A. W. Pinero, The Times, v., i. What are you so glum about.
Glump, verb. (provincial).—To sulk. Hence glumpy, glumping, and glumpish = sullen or stubborn.