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Synonyms for Reserved (same or very similar meaning)

WordNet sense 1 (reserved in advance):
engaged

WordNet sense 2 (tending to reserve or introspection):
withdrawn

WordNet sense 3 (showing modest reserve):
diffident

WordNet sense 4 (remote in manner):
aloof, distant

WordNet sense 5 (cool and formal in manner):
restrained, reticent, unemotional


From the ODE community, based on WordNetadd/edit