intense - (adj.): If something is intense, it has a very strong feeling or effect.  An intense activity is very serious and uses a lot of effort.  Someone who is intense has very strong feelings or opinions.

• Synonyms: strong, powerful, forceful, deep, extreme, severe, vivid, keen
• Antonyms: calm, dull, mild, neutral, nonchalant, weak, relaxing
• Related words: intensity, intensive, intention
• Origin: 1400 Latin, from intendere meaning "to stretch out, strain"
• Example: MontCAS testing can be a little intense, but if you just take your time and enjoy the quiet, it can be kind of relaxing, too.

Watch and listen to this video to see some other intense moments!

What is it about something that makes it so intense?