- Corrosively Adv
- Corruptibly Adv
- Corruptly Adv
- Cortically Adv
- Cosily Adv
- Cosmetically Adv
- Cosmically Adv
- Costively Adv
- Couchantly Adv
- Countably Adv
- Counteractively Adv
- Counterclockwise Adj Adv
- Counterfeitly Adv
- Counterinsurgently Adv
- Counterproductively Adv
- Countlessly Adv
- Countrywide Adj Adv
- Countrywise Adj Adv
- Courageously Adv
- Courteously Adv
- Courtly Adj Adv
- Covalently Adv
- Covariantly Adv
- Covertly Adv
- Covetously Adv
- Cowardly Adv
- Coyly Adv
- Cozily Adv
- Crabbily Adv
- Crabwise Adj Adv
- Craftily Adv
- Craggily Adv
- Cranially Adv
- Crankily Adv
- Crassly Adv
- Cravenly Adv
- Cravingly Adv
- Crazily Adv
- Creakily Adv
- Creamily Adv
- Creatively Adv
- Credibly Adv
- Creditably Adv
- Credulously Adv
- Creepily Adv
- Crescendo Noun Adj Adv Verb
- Crestfallenly Adv
- Criminally Adv
- Criminologically Adv
- Crispily Adv
- Crisply Adv
- Critically Adv
- Croakily Adv
- Cronishly Adv
- Crookedly Adv
- Cross-country Adj Noun Adv
- Crossly Adv
- Crosswise Adj Adv
- Croupily Adv
- Crucially Adv