Nerd as a stereotypical, archetypal and frequently used informally as a derogatory designation, refers to somebody who passionately pursues intellectual or esoteric knowledge or pastimes rather than engaging in social life, such as participating in organized sports or other mainstream social activities. The Merriam-Webster definition is an "unstylish, unattractive, or socially inept person: especially: one slavishly devoted to intellectual or academic pursuits." While Nerd, Dork and Geek share in passionate pursuit of detailed knowledge, the Australian colloquialism dag shares the association with the unfashionable and socially inept with the added feature of being affable and amusing. A nerd is often excluded from physical activity, and is often considered a loner by peers.