You use meaningfully to indicate that someone has deliberately chosen their words in order to express something in a way which is not obvious but which is understood by the person they are talking to.
'I have a knack for making friends, you know,' she added meaningfully.
'I was once as bewildered as you are,' she said meaningfully.
2. See also meaningful
Examples of 'meaningfully' in a sentence
meaningfully
Can these devout pieces speak meaningfully in a modern, urban space?
Times, Sunday Times (2016)
We speak meaningfully of the prevailing atmosphere of an office or of a mill.
Peter F. Drucker MANAGEMENT: task, responsibilities, practices (1974)
He looked meaningfully at his successors and prepared to leave.
Times, Sunday Times (2009)
Life has been reduced to temporal pursuits disconnected from all the other disciplines necessary for life to be meaningfully engaged.
Christianity Today (2000)
If so, this D-Day anniversary will look as meaningfully towards the future as the past.
Times, Sunday Times (2014)
The personnel staff, for example, must overcome its specialized and fragmented character if it is to contribute meaningfully to the design and operation of productivity improvement programs.
Tompkins, Jonathan Human Resource Management in Government (1995)