Pretentious, informally, can be defined as hifalutin (9 letters) and tootoo (6 letters). Hifalutin is an adjective derived from the word 'HIGHFALUTIN', which is a combination of 'HIGH' and 'falutin'. It is used to describe someone who is overly pompous or pretentious. Tootoo is a slang term that is used to describe someone who is trying to act superior or important. Both terms are used to describe someone who is being pretentious in an informal setting.