This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or relating to dispossessed, often displaced people who have been cut off from the socioeconomic class with which they would ordinarily be identified: lumpen intellectuals unable to find work in their fields.

adj. Of or relating to the lumpenproletariat.

adj. Vulgar or common; plebeian: "Popular novelists and their mass readership remain a despised lumpen minority” ( Leslie Fiedler).

n. The lumpenproletariat.

n. A member of the lumpenproletariat.

adj. Of or referring to social outcasts.

adj. Of or relating to the lumpenproletariat.

adj. Plebeian

adj. mentally sluggish.

n. same as lumpenproletariat.

n. The European eelpout; -- called also lumper.

Past participle of limp.

adj. mentally sluggish

"Writing at some length at Labour Home about the complexity of the supposed "swing" to the Tories and the need to do the business for fairness I am a little surprised for this to be described as a lumpen core vote strategy and linked with some worthy Wiseman wishes and thepowerlesslowpaid's slogans by one Stephen Farrington of Cardiff."

stupid   

lumpenproletariat    lumper   

lumpish    sluggish    unthinking