voyeur
From Longman Dictionary of Contemporary EnglishRelated topics: Psychology, psychiatryvoyeurvoy‧eur /vwɑːˈjɜː $ -ˈjɜːr/ noun [countable] 1 SYsomeone who gets sexual pleasure from secretly watching other people’s sexual activities2 MPsomeone who enjoys watching other people’s private behaviour or suffering —voyeurism noun [uncountable] —voyeuristic /ˌvwɑːjəˈrɪstɪk◂/ adjective —voyeuristically /-kli/ adverbOrigin voyeur (1900-2000) French “person who sees”, from voir “to see”