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be sure

VERB
tell
Synonyms
STRONGEST
identify know learn see
STRONG
ascertain clinch comprehend deduce determine differentiate discover discriminate distinguish divine perceive recognize
WEAK
find out know for certain make out
Antonyms
STRONGEST
overlook
STRONG
confuse misinterpret miss misunderstand mix up
WEAK
estimate figure guess listen

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