(ordered by popularity)
solid
very
firm
good
theoretical
strong
only
sure
real
sound
economic
concrete
private
scientific
true
necessary
basic
legal
historical
philosophical
moral
secure
broad
proper
religious
better
original
essential
sufficient
rational
empirical
stable
conceptual
spiritual
adequate
ultimate
firmer
intellectual
ideological
logical
sole
substantial
slightest
charitable
weak
excellent
educational
permanent
mathematical
psychological
theological
ethical
shaky
elastic
metaphysical
indispensable
biological
stronger
nonprofit
least
slight
ontological
objective
royal
sandy
biblical
broader
insecure
deeper
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