Thesaurus.com
Dictionary.com
Definitions

self-conscious

[self-kon-shuhs, self-] / ˈsɛlfˈkɒn ʃəs, ˌsɛlf- /
ADJECTIVE
insecure with oneself
Synonyms
STRONGEST
anxious awkward bashful embarrassed mannered nervous sheepish shy stiff stilted uncomfortable uneasy unsure
WEAK
affected artificial diffident discomfited ill at ease out of countenance shamefaced uncertain
Antonyms
STRONGEST
calm comfortable confident content easy graceful happy unashamed unshy unworried
WEAK
assured secure sure unself-conscious

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.