offhandedly

An offhanded remark is something said quickly and without much thought.

When people use the word "offhandedly" to describe how someone said or did something, they usually mean that it was done without much care or attention. For example, if you ask your friend what he thinks about a new movie and he gives an offhand answer like "I guess it's okay," that means his response wasn't thought through very carefully. He might not have even seen the whole movie! People often use this word when talking about comments or actions that seem casual or spontaneous, but might actually hide something more serious.