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weighty

[wey-tee] /ˈweɪ ti/
adjective, weightier, weightiest.
1.
having considerable weight; heavy; ponderous:
a weighty bundle.
2.
burdensome or troublesome:
the weightier cares of sovereignty.
3.
important or momentous:
weighty negotiations.
4.
having or exerting influence, power, etc.; influential:
a weighty merchant of Boston.
Origin of weighty
1480-1490
1480-90; see weight, -y1
Related forms
weightily, adverb
weightiness, noun
unweighty, adjective
Synonyms
3. significant, serious, grave, consequential. See heavy.
Antonyms
1, 3. light. 3. unimportant.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for weighty

weighty

/ˈweɪtɪ/
adjective weightier, weightiest
1.
having great weight
2.
important or momentous
3.
causing anxiety or worry
Derived Forms
weightily, adverb
weightiness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for weighty
adj.

"important, serious, grave," late 15c., from weight + -y (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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