secretly; in a sneaky way
en secret; de manière rusée (en secret; de manière rusée)
"He met her on the sly without telling anyone."
"Il l'a rencontrée en secret sans le dire à personne." (Il l'a rencontrée **en secret** sans le dire à personne.)
to feel responsible for many problems or duties
to stay more advanced or knowledgeable than others
Strong belief can achieve the impossible.
to clearly describe an inspiring future goal
to be able to think of interesting and unusual ideas
to move repeatedly around something