Confident

/ˈkɒnfɪd(ə)nt/
adjective
1 Feeling or showing confidence in oneself or one’s abilities or qualities.
2 Feeling or showing certainty about something.

Origin
Late 16th century: from French confident(e), from Italian confidente, from Latin confident- ‘having full trust’, from the verb confidere, from con- (expressing intensive force) + fidere ‘trust’.

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Harry was confident his design would work just as well as available commercial machines. He was also very proud it could be made cheaply, on-site, from local materials.

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Like most of you, I wonder what the machine does! This example sentence is aggressively vague. The image doesn’t help beyond telling us it isn’t the first version.
Nonetheless, I am pulling for Harry. There are plenty of developing countries which need skills like his.

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