Leadened

[led-n] /ˈlɛd n/

adjective
1.
inertly heavy like ; hard to lift or move:
a leaden weight; leaden feet.
2.
dull, spiritless, or gloomy, as in mood or thought:
leaden prose; a leaden atmosphere.
3.
of a dull gray color:
leaden skies.
4.
oppressive; heavy:
a leaden silence.
5.
sluggish; listless:
They moved at a leaden pace.
6.
of poor quality or little value.
7.
made or consisting of .
verb (used with object)
8.
to make leaden, sluggish, dull, etc.:
Fatigue had leadened his brain and step.
/ˈlɛdən/
adjective
1.
heavy and inert
2.
laboured or sluggish: leaden steps
3.
gloomy, spiritless, or lifeless
4.
made partly or wholly of lead
5.
of a dull greyish colour: a leaden sky
adj.

“made of lead,” Old English leaden, from lead (n.1) + -en (2). The figurative sense of “heavy, oppressive, dull” is attested by 1570s. Related: Leadenly; leadenness.