great interest

You usually pair this phrase with the preposition in. You would say, "I have a great interest in photography." You can also use it to describe how you listen to someone. If a friend tells a story, you can listen "with great interest." It works as a noun phrase. You can 'show' it, 'have' it, or 'express' it. It is like a badge of curiosity you wear.

Use it when you want to sound sincere and polite. It is perfect for job interviews when discussing company goals. Use it when meeting new people to show you are paying attention. It works well in emails when asking for more details. If you are texting a crush about their hobby, it shows you are really listening. It makes you sound thoughtful and engaged in the conversation.

Avoid using it for very small, unimportant things. Don't say you have a great interest in a piece of gum. That sounds sarcastic or just plain weird. Also, don't use it if you are actually bored. People will see through it! If you are at a party and want to sound very casual, try 'into' instead. Saying "I'm really into this" is better for a loud club than great interest.

In English-speaking cultures, showing great interest is considered a sign of high intelligence and good manners. It suggests you are an 'active listener.' This is a valued trait in both business and friendships. Historically, being a 'person of interests' meant you were well-educated and worldly. Today, it is a polite way to build rapport without being too aggressive or overly emotional.

You might hear people say keen interest or deep interest. Keen interest sounds a bit more British or academic. Deep interest suggests a very emotional or long-term connection. You can also say someone is intrigued by something. However, great interest remains the most versatile 'all-rounder' for any situation. It is the 'white t-shirt' of English collocations—it fits everywhere!