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heav‧ily W3

1 in large amounts, to a high degree, or with great severity [= very]:
5 if you do or say something heavily, you do it slowly and with a lot of effort, especially because you are sad or bored :
He was walking heavily, his head down.
Emily sighed heavily.
'I suppose so,' she said heavily.
He was walking heavily, his head down.
Emily sighed heavily.
'I suppose so,' she said heavily.6 to do something a lot or be very interested in it :
Sid was heavily into drugs by the time he left school.
be heavily into something
informal
Sid was heavily into drugs by the time he left school.