adj. feeling so satisfied that you feel you do not need to try any harder

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complacent

​It's important to stay curious and keep challenging ourselves so we don't become complacent and miss out on exciting opportunities to try new things.

an effusive laughter

an effusive welcome

​effusive

​adj. expressing in a way that shows very strong feelings

Let's confine our discussion to the matter in question please!

The butterfly didn't like being confined in a jar, so we let it fly free again.

​confine

​v. to limit activity/person etc in some way