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1. Made of or containing lead.
a. Heavy and inert.
b. Listless; sluggish.
3. Lacking liveliness or sparkle; dull: a leaden conversation.
4. Downcast; depressed: leaden spirits.
5. Dull, dark gray in color: drizzle from a leaden sky.

lead′en·ly adv.
lead′en·ness n.
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A deficiency in mental and physical alertness and activity:
References in periodicals archive ?
But an excess of levity can quickly become its own kind of leadenness, and for long stretches between its genuinely amusing gags and set pieces, Thor: Ragnarok, credited to the screenwriting trio of Eric Pearson, Craig Kyle and Christopher Yost, is a bit too taken with its own breezy irreverence to realise when it's time to rein it in.
The ritualistic aspects of Zaubeiflote can drift toward leadenness, but Barrett helped generate an emotional immediacy that lifted the production into a more universal emotional territory.
We acknowledge the leadenness of the previously mentioned conferences, but, in this work, we wanted to isolate the LA/EDM research and focus on its strengths, weaknesses, opportunities and threats.