lubber
Concise Oxford English Dictionary © 2008 Oxford University Press:
lubber/ˈlʌbə/
▶noun archaic or dialect a big, clumsy person.
– derivatives
lubberlike adjective,
lubberly adjective & adverb.
lubberlike adjective,
lubberly adjective & adverb.
– origin ME: perh. via OFr. lobeor ‘swindler, parasite’ from lober ‘deceive’.
'lubber' also found in these Oxford entries:

