obstino

Etymology
From.

Noun

 * 1) pertinacity, obduracy, obstinacy, stubbornness

Etymology
From, the latter an unattested verb from , from. Related to. Compare and  from the same stem.

Verb

 * 1)  to resolve, determine, be firmly resolved, persist

Usage notes
Finite forms are rare; the most common form by far is the perfect passive participle.