1) To continue steadfastly or firmly in some state, purpose, course of
action, or the like, especially in spite of opposition, remonstrance,
The act or fact of persisting; the quality of being persistent.
Verbal noun from → persist.
Persisting, especially in spite of opposition, obstacles, discouragement, etc.; persevering (Dictionary.com).
Adjective from → persist.
partow-e X paristandé
Fr.: rayons X persistants