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apprehension

1. 1．a feeling of worry or fear that something bad might happen

   Many of us face our retirement with apprehension.

   Anja noticed the look of apprehension on his face.
2. 2.   (FORMAL) the act of arresting someone
3. 
   

in-depth

thorough and detailed

~an in-depth study of immigration law

http://www.macmillandictionary.com/dictionary/british/in-depth_4

empty-nester

empty nester

noun

a parent whose children have reached adulthoodand left home.

Also, emp·ty-nest·er.

uprising

a political situation in which a large group of  

people opposes and tries to defeat the

government or a ruler

~an armed uprising against the monarchy

http://www.macmillandictionary.com/dictionary/british/uprising

radical

rad·i·cal [rad-i-kuhl] Show IPA 
adjective 
1. of or going to the root or origin; fundamental: a radical difference. 
2. thoroughgoing or extreme, especially as regards change from accepted or traditional forms: a radical change in the policy of a company. 
3. favoring drastic political, economic, or social reforms: radical ideas; radical and anarchistic ideologues.

adapted from :http://dictionary.reference.com/browse/radical