From a part of Pollyanna written by Elenor Porter:
"There ain't no tellin'," sobbed Nancy. "She lay back that white an' still she might easy be dead; but Miss Polly said she wa'n't dead--an' Miss Polly had oughter know, if any one would--she kept up such a listenin' an' a feelin' for her heartbeats an' her breath!"
In the cited passage, what part of speech is easy, and what is its meaning??