This is the 3292nd most frequent Russian word.
открытый
"Open" or "accessible."
Here, 'открытом' (open) is used as an adjective to describe the field being unobstructed or exposed.
Его дом находится в открытом поле.
His house is located in an open field.
In this sentence, 'открытой' (open) characterizes a person's personality as being honest or transparent.
Она всегда была открытой и дружелюбной.
She has always been open and friendly.
Here, 'открытым' (open) metaphorically indicates an unresolved or pending state.