The word 'boobish' is an informal slang term used to describe a person or situation that appears foolish or stupid. Some synonyms for 'boobish' include 'silly', 'ridiculous', 'foolish', 'senseless', 'stupid', 'daft', 'dull-witted', 'dim', 'unwise', 'ignorant', and 'naive'. These words can be used interchangeably with 'boobish' depending on the context. For example, instead of saying someone is acting 'boobish', one could say they are behaving 'naively'. Overall, these synonyms can add variety and clarity to one's vocabulary by providing alternative ways of expressing the same idea.