Un-thoughtful is a word used to describe a person who fails to consider the feelings or needs of others. There are several synonyms for this word that can be used to convey a similar meaning. "Inconsiderate" is one common synonym which describes someone who is careless or thoughtless. "Selfish" can also be used to describe someone who is focused solely on themselves and does not consider the needs of others. "Insensitive" conveys a lack of empathy or understanding towards others' feelings. Other synonyms include "rude," "uncaring," "callous," and "thoughtless." All of these words can be used to describe a person who is not mindful of how their actions or words impact others.