tread carefully
To exercise precaution; to be careful with regards to the situation; to tread lightly.
adv
Sorrowfully.
[…] there was she faine / To call them all in order to her ayde, / And them conjure, upon eternall paine, / To counsell her, so carefully dismayd, / How she might heale her sonne […]
With care; attentively, circumspectly.
As he was a politician, he discussed all subjects carefully, not offending anyone.
He carefully studied the papers, while planning his next move.
Conscientiously, painstakingly, fastidiously, meticulously