To have to act very sensitively to avoid offending someone.

Something worth thinking seriously about.

Try to do more than one is capable of doing.

Reveal a secret.

To have something more important to do.

You can’t enjoy both of two desirable but mutually exclusive alternatives (can’t have your own business, take care of everything, succeed, and also not be tired

A difficult problem or a difficult person

A project works best if there is input from a limited number of people.

Something is the best and most useful innovation or development invented for a long time.

Very similar, especially in appearance.

Someone who does bad things or who you don’t trust

Easy tasks, the most easily achieved of a set of tasks, measures, goals, etc.

A very determined person.