(ordered by popularity)
personal
private
direct
effective
verbal
mass
nonverbal
interpersonal
human
oral
open
way
free
constant
intercultural
electronic
internal
poor
better
international
clear
organizational
visual
telegraphic
face
regular
easy
mediated
cultural
wireless
successful
informal
official
close
rapid
frequent
linguistic
formal
meaningful
persuasive
symbolic
honest
confidential
patient
indirect
privileged
written
asynchronous
global
intercellular
divine
daily
instant
vocal
efficient
secret
inter
interprocess
synchronous
upward
mutual
everyday
improved
adequate
interactive
emotional
instantaneous
therapeutic
telephonic
based
intimate
satellite
digital
preliminary
ongoing
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