really

The word "really" is small, but it does a lot of work in everyday English. Most often, it is an adverb used to add force. In "It's really cold outside," it means "very." In "She really enjoyed the concert," it shows that the feeling was strong and genuine.

It can also point to truth or fact. If someone says, "I really mean it," they are saying they are sincere. If you ask, "Did that really happen?" you are asking whether something is actually true. In this way, the word often moves between the ideas of "very," "truly," and "actually," depending on the sentence.

"Really?" can stand alone as a reaction. In speech, it may show surprise, doubt, interest, or even mild disbelief. Tone of voice matters a lot here. A warm "Really?" can invite someone to say more, while a flat or sharp "Really?" can sound doubtful.

The word is also common in questions and challenges such as "Are you really sure?" or "Do you really want to go?" In these cases, it asks the listener to think again or confirm what they said.

In casual conversation, people sometimes use "really" as a filler while thinking or speaking. That is natural, but overusing it can make speech or writing feel repetitive. Used well, it is a flexible everyday word that helps speakers add strength, show sincerity, or react to new information.