- Copiously Adv
- Copulatively Adv
- Coquettishly Adv
- Cordately Adv
- Cordially Adv
- Cordlessly Adv
- Cornily Adv
- Corporally Adv
- Corporately Adv
- Corporeally Adv
- Corpulently Adv
- Correctively Adv
- Correctly Adv
- Correlatively Adv
- Correspondently Adv
- Correspondingly Adv
- Corrigibly Adv
- Corroboratively Adv
- 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