宅的意思就是喜欢经常呆在家里（always stay at home）上网，看书，玩游戏。。。,it is an adjective examples:宅男，宅女，我很宅~ it can be a verb as well,for example,我今天打算宅在家里不出去了

宅 is another word for 冢 or home. Five thousands years in Chinese culture, no one will use 宅 by itself, it has to be grouping with another word or words to mean something. You always hear 宅 was spoken by people. I bet, they are non- Chinese or this question has been prefixed with answer. For example: Ms Courtney's answer is " always stay at home" . Here, she use more than one words, instead of the word 宅 by itslelf. I would argue, it means "always not stay at home" 他常常离宅". Moreover 我很宅, it is a colloquial, not everychinese would understand. I think, you already got the answer, "宅", the Chinese speaking people will not used it without grouping with another word(s).

我想 比較完整的字源解釋在這兒 諸君參考 http://zh.wikipedia.org/zh-tw/%E5%AE%85%E7%94%B7 MR. WOZITOYA 說 五千年來 宅字不獨用 必須與他字構詞 此說 誤解了 漢語構詞由單音字到複音詞的歷史演變過程 宅字在古文中獨用 不勝枚舉 再者 漢字 "差一點, 差很多" 諸如 天大太犬 甲由申中 之類 家是活人所居之所 冢是死人所躺之處 一點之差 謬以千里矣

不想出去，不喜欢和外界多接触，只想呆在家里

like stay at home