(ordered by popularity)
important
social
political
environmental
major
ethical
key
various
economic
specific
several
legal
current
related
critical
controversial
moral
complex
basic
theoretical
fundamental
main
methodological
technical
contemporary
difficult
central
international
practical
domestic
larger
unresolved
cultural
relevant
broader
serious
following
significant
substantive
crucial
global
constitutional
philosophical
conceptual
sensitive
psychological
racial
vital
strategic
emotional
wider
contentious
educational
outstanding
developmental
broad
organizational
theological
regional
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