Translation of "رُبمّا" in English

رُبمّا لا تُلاحظُ أنَّ الوقتَ يمضي.

you might not notice time going by.

رُبمّا يظهرون من دونِ الشعور بأنه يتعينُ عليكَ بذلُ الكثيرِ من الجُهد

might arise for you without feeling like you had to engage in that much effort