(ordered by popularity)
certain
such
many
historical
few
important
following
basic
interesting
actual
hard
relevant
real
essential
particular
observed
main
scientific
simple
true
objective
physical
above
specific
empirical
fundamental
additional
bare
pertinent
significant
experimental
concrete
plain
obvious
salient
principal
curious
mere
available
psychological
external
key
isolated
cold
biological
elementary
observable
foregoing
known
necessary
numerous
striking
stylized
historic
unpleasant
remarkable
biographical
familiar
solid
indisputable
alleged
ultimate
useful
physiological
statistical
definite
related
enough
linguistic
fast
geographical
vital
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