adjective, weightier, weightiest.
having considerable weight; heavy; ponderous: a weighty bundle.
burdensome or troublesome: the weightier cares of sovereignty.
important or momentous: weighty negotiations.
having or exerting influence, power, etc.; influential: a weighty merchant of Boston.

1480–90; see weight, -y1

weightily, adverb
weightiness, noun
unweighty, adjective

3. significant, serious, grave, consequential. See heavy.

1, 3. light. 3. unimportant.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
weighty (ˈweɪtɪ)
adj , weightier, weightiest
1.  having great weight
2.  important or momentous
3.  causing anxiety or worry

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Holding a heavy clipboard leads to weighty decisions.
They must be identifiable, demonstrable, and genuinely weighty enough to offset
  the dangers inherent in concentration.
However, this is not to say that the album is a weighty, serious affair.
One weighty book tops my gift list this holiday season.
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