insensibly怎么读？

Tom presently began to drift insensibly back into the concerns of this life again.不久,汤姆不知不觉地关心起眼前的现实来.These seasons of silence had insensibly been growing more and more frequent of late.近来这种沉默的局面不知不觉地越来越常见了.Science is al...

adv.无知觉地，没有知觉地，极微地，徐徐地...