Neanderthal

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An extinct human species (Homo neanderthalensis) or subspecies (Homo sapiens neanderthalensis) living during the late Pleistocene Epoch throughout most of Europe and parts of Asia and northern Africa and associated with Middle Paleolithic tools.
2. n. An individual belonging to this species or subspecies.
3. n. Slang A crude, boorish, or slow-witted person.
4. adj. Of, having to do with, or resembling Neanderthals.
5. adj. Slang Crude, boorish, or slow-witted.

Wiktionary

1. adj. Of or pertaining to Homines neanderthalenses.
2. adj. Old-fashioned, opposed to change (in allusion to Homo neanderthalensis).
3. adj. Of or pertaining to the Neander Valley in Germany.
4. n. A specimen of the now extinct species Homo neanderthalensis.
5. n. pejorative A primitive person.

GNU Webster's 1913

1. adj. (Anthropol.) Of, pertaining to, or named from, the Neanderthal, a valley in the Rhine Province, in which were found parts of a skeleton of an early type of man. The skull is characterized by extreme dolichocephaly, flat, retreating forehead, with closed frontal sutures, and enormous superciliary ridges. The cranial capacity is estimated at about 1,220 cubic centimeters, being about midway between that of the Pithecanthropus and modern man. pertaining to or designating the Neanderthal race, or Neanderthal man, a species of extinct robust humans, believed to have been widespread in the Middle Paleolithic in Europe and western Asia.
2. adj. Similar to or reminiscent of a neanderthal human; troglodytic; primitive and uncultured.
3. n. (Anthropol.) A neanderthal human being; a member of the race Homo sapiens neanderthalensis.
4. n. One resembling a neanderthal human; a troglodyte; a cave man.
5. n. A person of primitive, unenlightened or uneducated opinions or attitudes; one with a regressive social or political outlook; -- used disparagingly.