This is the 164th most frequent Bulgarian word.
вероятно
Likely; probably.
In this instance, 'вероятно' suggests a belief or assumption about a past event.
Те вероятно вече са пристигнали.
They have probably already arrived.
In this sentence, 'вероятно' is used as an adverb to express a likelihood or probability about a future event.
Вероятно ще вали дъжд утре.
It will probably rain tomorrow.
Here, 'вероятно' modifies an adjective phrase, emphasizing the high probability of a personal opinion or evaluation.