This is the 3692nd most frequent Russian word.
тяжело
"Тяжело" means "heavily" or "with difficulty."
'Тяжело' here expresses a personal difficulty or challenge experienced by the subject.
Мне тяжело вставать рано утром.
It is hard for me to wake up early in the morning.
'Тяжело' describes emotional or situational difficulty or gravity in the context.
Он тяжело переживает утрату.
He is coping heavily with the loss.
'Тяжёло' relates to physical weight and the inability to bear or move it.