The beasts primal instincts dictated its behavior.
The word you're looking for is "Primal."Correction:'Basic nature' is a noun phrase, but 'primal' is an adjective. If you are happy with the connotations of 'primal', the form you need is 'primality'.
The sentence, Janet thought Sean's answer was very reassuring, is an example of how to use reassuring in a sentence.
Thankfully, we are all unhurt.
Apple trees are deciduous.
The best sentence to use the word meniscus in is in a science sentence. You could say the meniscus of the liquid reads at 2 centiliters.
Protecting our children is a universal primal instinct.
No orbs can be used during boss battles
Primal Kyogre's new attack is Origin Pulse and Primal Groudon's new attack is called Precipice Blades.
Primal Carnage was created in 2012.
Primal Carnage happened in 360.
The Primal Wound was created in 1993.
Primal Pictures was created in 1991.
Primal Prey happened in 2001.
Primal Rage was created in 1994.
Primal Rage happened in 1994.
The Primal Solution was created in 1977.
The Primal Urge was created in 1961.