Psa. 81:12 KJV (With Strong’s)

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12
Sod I gave them up
shalach (Hebrew #7971)
to send away, for, or out (in a great variety of applications)
KJV usage: X any wise, appoint, bring (on the way), cast (away, out), conduct, X earnestly, forsake, give (up), grow long, lay, leave, let depart (down, go, loose), push away, put (away, forth, in, out), reach forth, send (away, forth, out), set, shoot (forth, out), sow, spread, stretch forth (out).
Pronounce: shaw-lakh'
Origin: a primitive root
βunto their own hearts’
leb (Hebrew #3820)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect; likewise for the centre of anything
KJV usage: + care for, comfortably, consent, X considered, courag(-eous), friend(-ly), ((broken-), (hard-), (merry-), (stiff-), (stout-), double) heart((-ed)), X heed, X I, kindly, midst, mind(-ed), X regard((-ed)), X themselves, X unawares, understanding, X well, willingly, wisdom.
Pronounce: labe
Origin: a form of 3824
lust
shriyruwth (Hebrew #8307)
obstinacy
KJV usage: imagination, lust.
Pronounce: sher-ee-rooth'
Origin: from 8324 in the sense of twisted, i.e. firm
: and they walked
yalak (Hebrew #3212)
to walk (literally or figuratively); causatively, to carry (in various senses)
KJV usage: X again, away, bear, bring, carry (away), come (away), depart, flow, + follow(-ing), get (away, hence, him), (cause to, made) go (away, -ing, -ne, one's way, out), grow, lead (forth), let down, march, prosper, + pursue, cause to run, spread, take away ((-journey)), vanish, (cause to) walk(-ing), wax, X be weak.
Pronounce: yaw-lak'
Origin: a primitive root (compare 1980)
in their own counsels
mow`etsah (Hebrew #4156)
a purpose
KJV usage: counsel, device.
Pronounce: mo-ay-tsaw'
Origin: from 3289
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Cross References

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I gave.
their own hearts' lust.
or, the hardness of their hearts, orimaginations.
they walked.

J. N. Darby Translation

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12
So I gave them up unto their own hearts’ stubbornness: they walked after their own counsels.