weighty

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weighty /ˈweɪti/ adjective
weightier; weightiest
weighty
/ˈweɪti/
adjective
weightier; weightiest
Learner's definition of WEIGHTY
[also more weighty; most weighty]
: having a lot of weight : heavy
: very important and serious
: having the power to influence the opinions of other people

— weightiness

/ˈweɪtinəs/ noun [noncount]