ADJ
barely audible, the barest, faint, gentle, hushed, low, mere/the merest, soft | fierce, harsh
audible, loud, stage
She leaned close and spoke in an audible whisper so everyone in the room could hear her secret.
hoarse, husky, strangled | awed, excited, urgent | confidential, conspiratorial
PREP
above a ~
She leaned close and spoke so softly that her voice was barely above a whisper.
in a ~
The teacher asked the students to read in whispers so they wouldn't disturb the class next door.
ADV
softly | hoarsely, huskily, thickly
fiercely, urgently
She whispered fiercely to her friend during the quiet library study session.
brokenly, shakily, unsteadily | angrily, bitterly, furiously | confidentially, conspiratorially | excitedly | almost, half
back
She whispered back that she couldn't hear him clearly from across the room.
VERB + WHISPER
can/could only
After the operation, the patient could only whisper for several days.
hear sb
I could hear my friend whisper something funny during the boring lecture.
PREP
about
The students whispered about the surprise party planned for their teacher.
against
She whispered against his shoulder so no one else could hear what she was saying.
through
She whispered through the darkness to warn her friend about the approaching footsteps.
to
He whispered to his friend that the movie was about to start.
PHRASES
whisper sth in/into sb's ear, whisper sweet nothings
She leaned close and whispered sweet nothings to her boyfriend during the romantic dinner.