Psa. 78:18 KJV (With Strong’s)

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18
Andf they tempted
nacah (Hebrew #5254)
to test; by implication, to attempt
KJV usage: adventure, assay, prove, tempt, try.
Pronounce: naw-saw'
Origin: a primitive root
God
'el (Hebrew #410)
strength; as adjective, mighty; especially the Almighty (but used also of any deity)
KJV usage: God (god), X goodly, X great, idol, might(-y one), power, strong. Compare names in "-el."
Pronounce: ale
Origin: shortened from 352
in their heart
lebab (Hebrew #3824)
the heart (as the most interior organ); used also like 3820
KJV usage: + bethink themselves, breast, comfortably, courage, ((faint), (tender-)heart((-ed)), midst, mind, X unawares, understanding.
Pronounce: lay-bawb'
Origin: from 3823
by asking
sha'al (Hebrew #7592)
a primitive root; to inquire; by implication, to request; by extension, to demand
KJV usage: ask (counsel, on), beg, borrow, lay to charge, consult, demand, desire, X earnestly, enquire, + greet, obtain leave, lend, pray, request, require, + salute, X straitly, X surely, wish.
Pronounce: shaw-al'
Origin: or shael {shaw-ale'}
meat
'okel (Hebrew #400)
food
KJV usage: eating, food, meal(-time), meat, prey, victuals.
Pronounce: o'-kel
Origin: from 398
for their lust
nephesh (Hebrew #5315)
properly, a breathing creature, i.e. animal of (abstractly) vitality; used very widely in a literal, accommodated or figurative sense (bodily or mental)
KJV usage: any, appetite, beast, body, breath, creature, X dead(-ly), desire, X (dis-)contented, X fish, ghost, + greedy, he, heart(-y), (hath, X jeopardy of) life (X in jeopardy), lust, man, me, mind, mortally, one, own, person, pleasure, (her-, him-, my-, thy-)self, them (your)-selves, + slay, soul, + tablet, they, thing, (X she) will, X would have it.
Pronounce: neh'-fesh
Origin: from 5314
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Cross References

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J. N. Darby Translation

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18
And they tempted *God in their heart, by asking meat for their lust;