An idiot totally lacking in personal hygiene and social skills.

an insignificant student who is ridiculed as being affected or studying excessively

a good student and a geek is a poor student

a lesser geek

an intelligent person fascinated by knowledge and learning

an intelligent person who is passionate about learning

a person regarded as stupid, socially inept, or unattractive

a person that continually studies and knows a lot more than you do or habitually does things socially that you think are creepy

a person who can sustain attention in something long after a normal person has lapsed into a coma

a person with no social skills, usually obsessed with science or technology (geek is more computer specific)

a poor student and a geek is a good student

a step below Geek, and it is typically impossible to rise up from this step to the one above without it being the subject of a lame-ass Disney movie

a technically bright but socially inept person

a very intelligent but lonely person who is fascinated by knowledge and Science

Intelligent, obsessive, and socially inept person. Usually associated with computers or other technical pursuits (see also "Geek").

n. A person that tends to be immersed in cerebral interests, often at the expense of social functionality. These people can be recognized by their distinctive pit-stained polyester shirts and pocket-protectors. (See also geek)

A nerd is very similar to a geek, but with more RAM and a faster modem. Nerds often find geeks dull because geeks don't spend enough time talking about computers.

A term coined in the 1980s to describe intelligent but socially inept people. The term is often associated with Bill Gates. It has fallen out of favor...

A person with advanced technological skills and interests. Nerds typically have limited social skills and their mothers dress them funny.

Technologically smart, but not socially active.

A generally pejorative term for someone of above-average intelligence but who has poorly developed social skills and is sartorially challenged.

Nerd, as a stereotypical or archetypal designation, refers to somebody who passionately pursues intellectual or esoteric knowledge or pastimes, rather than engaging in a social life, participating in organized sports, or other mainstream activities. The Merriam-Webster definition is an "unstylish, unattractive, or socially inept person; especially: one slavishly devoted to intellectual or academic pursuits."