1.
A ~ action is something that you do because someone else makes you do it.
A system of ~ labour was used on the cocoa plantations.
ADJ: ADJ n
2.
A ~ action is something that you do because circumstances make it necessary.
He made a ~ landing on a highway.
ADJ: ADJ n
3.
If you describe something as ~, you mean it does not happen naturally and easily.
...a ~ smile...
She called him darling. It sounded so ~.
? natural
ADJ