Adjective : apprehensive for the safety of the mountain climbers.    From Dictionary.com. 

Looking apprehensively is something that could happen in any story.    From Wordnik.com.  [Superhero Nation: how to write superhero novels and comic books » Mnkyking’s Review Forum] Reference

"It is bad enough," responded Ruth, apprehensively.    From Wordnik.com.  [The Moving Picture Girls Snowbound Or, The Proof on the Film] Reference

"Something has happened!" she cried apprehensively.    From Wordnik.com.  [The Grell Mystery] Reference

Drake glanced toward the open window apprehensively.    From Wordnik.com.  [Nell, of Shorne Mills or, One Heart's Burden] Reference

She started and glanced at the house apprehensively.    From Wordnik.com.  [The Wind Before the Dawn] Reference

Mrs. Warren looked at her apprehensively for a moment.    From Wordnik.com.  [Ainslee's, Vol. 15, No. 6, July 1905] Reference

"What's a catamite?" the subject asked apprehensively.    From Wordnik.com.  [The Alembic Plot A Terran Empire novel] Reference

The latter gazed at him affectionately, apprehensively.    From Wordnik.com.  [The Seventh Noon] Reference

"Suppose we got snowed in?" asked Ruth, apprehensively.    From Wordnik.com.  [The Moving Picture Girls Snowbound Or, The Proof on the Film] Reference

Cherry, glancing apprehensively toward the trees again.    From Wordnik.com.  [At the Little Brown House] Reference

"What are the handcuffs for?" asked Myra apprehensively.    From Wordnik.com.  [Bandit Love] Reference

Coach and Blackwell looked at each other apprehensively.    From Wordnik.com.  [Over the Line] Reference

"What if it should rain?" questioned Emma apprehensively.    From Wordnik.com.  [Grace Harlowe's Overland Riders in the Great North Woods] Reference

The child glanced back at the school house apprehensively.    From Wordnik.com.  [Chicken Little Jane] Reference

Bobby looked at True apprehensively, and True said hastily.    From Wordnik.com.  ['Me and Nobbles'] Reference

"Oh, it's getting rough!" exclaimed Lottie, apprehensively.    From Wordnik.com.  [The Motor Girls on Crystal Bay or, The Secret of the Red Oar] Reference

"I hope Miss Howes doesn't forget," she said apprehensively.    From Wordnik.com.  [Miss Pat at School] Reference

"Oh! will there be rats and mice?" asked Ruth, apprehensively.    From Wordnik.com.  [The Moving Picture Girls in War Plays Or, The Sham Battles at Oak Farm] Reference

The prisoner looked up apprehensively as Malone shut the door.    From Wordnik.com.  [Supermind] Reference

Mrs. Brand's eyes were fixed apprehensively on Janetta's face.    From Wordnik.com.  [A True Friend A Novel] Reference

Mrs. Graham leaned forward eagerly, expectantly, apprehensively.    From Wordnik.com.  [Campfire Girls at Twin Lakes The Quest of a Summer Vacation] Reference

'Something has happened!' exclaimed Miss Abingdon apprehensively.    From Wordnik.com.  [Peter and Jane or The Missing Heir] Reference

"Don't you dare hold that close to me!" cried Ruth, apprehensively.    From Wordnik.com.  [The Moving Picture Girls at Rocky Ranch Or, Great Days Among the Cowboys] Reference

"Oh!" sighed Belle, apprehensively clutching the arm of her sister.    From Wordnik.com.  [The Motor Girls Through New England or, Held by the Gypsies] Reference

"'Sh!" hissed Roy, glancing around apprehensively toward the house.    From Wordnik.com.  [Rival Pitchers of Oakdale] Reference

Fuller, leaning from the cab, glanced apprehensively at the engineer.    From Wordnik.com.  [Tom of the Raiders] Reference

I stepped forward apprehensively and peeked into the dark, musty house.    From Wordnik.com.  [Unspoken Bonds] Reference

Russ and Paul looked curiously, and a bit apprehensively, at each other.    From Wordnik.com.  [The Moving Picture Girls at Rocky Ranch Or, Great Days Among the Cowboys] Reference

Marjorie waited apprehensively, wondering if Ellen were holding her own.    From Wordnik.com.  [Marjorie Dean, High School Freshman] Reference

Three years ago this week, I watched the invasion of Iraq apprehensively.    From Wordnik.com.  [Appalling--But Not Hopeless] Reference

I stepped back from William, and glanced apprehensively at the two members.    From Wordnik.com.  [Short Stories of Various Types] Reference

"Don't let him catch sight of us just yet," begged the girl apprehensively.    From Wordnik.com.  [Love at Paddington] Reference

There was a pause, while Nickey looked a bit apprehensively at his audience.    From Wordnik.com.  [Hepsey Burke] Reference

Standing in the sticky, sweet-smelling ooze, Alan eyed the robot apprehensively.    From Wordnik.com.  [Survival Tactics] Reference

"Golly, that pretty nearly hits us all, doesn't it?" said Griffin apprehensively.    From Wordnik.com.  [Miss Pat at School] Reference

Omega looked at Thalma apprehensively, for well he knew the meaning of that speck.    From Wordnik.com.  [Omega, the Man] Reference

Miss Cooper looked at me a little apprehensively, but I read confidence in her eyes.    From Wordnik.com.  [The Paternoster Ruby] Reference

He made a pretended rush at her with extended arms, and Nell shrieked apprehensively.    From Wordnik.com.  [Nell, of Shorne Mills or, One Heart's Burden] Reference

Having safely gained his own abode, the Writer gazed apprehensively out of the window.    From Wordnik.com.  [The Tale of Lal A Fantasy] Reference