Yesterday (NAIVE)' The term 'YESTERDAY (NAIVE)' can be broken down into two crossword solutions: BORN (4 letters). BORN is an adjective that means to have come into existence at a certain time or place. It is often used to refer to the birth of a person, animal, or plant. The word 'YESTERDAY' is an adverb that refers to the day before today. The word 'NAIVE' is an adjective that describes someone who is not experienced in the world and is therefore easily influenced or deceived. Together, the phrase 'YESTERDAY (NAIVE)' can be interpreted as someone who is inexperienced and easily influenced by the events of the day before.