Another word for the phrase 'to make sure' would be 'to ascertain'
make sure, confirm, check, double-check, determine, verify.
certain
confirm, bear out, prove, authenticate, validate, substantiate, corroborate, make sure, attest
another word for I don't know could be I'm not sure
no, its not another word for feelings but it can be a feeling im pretty sure.
positive
Simplistic. I'm pretty sure it's a word.
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perfect gentle
Another word for make low sounds is "murmur."
Sure. the
Another word that means certian is sure. As in : " Are you sure you want to get pizza instead of burgers?"