This is the 13330th most frequent Polish word.
osobista
"Osobista" means "personal" in English.
Here, 'osobistą' modifies 'odpowiedzialność' (responsibility), emphasizing the personal nature of the responsibility.
Mam osobistą odpowiedzialność za ten projekt.
I have personal responsibility for this project.
In this sentence, 'osobista' modifies 'opinia' (opinion), reflecting the subjective, individual nature of the opinion.
Moja osobista opinia jest inna niż większości grupy.
My personal opinion differs from the majority of the group's opinion.
Here, 'osobistych' (plural form) modifies 'sprawach' (matters), indicating that the matters are private or personal to the individual.