- Coevally Adv.
- Coextensively Adv.
- Cofinally Adv.
- Cogently Adv.
- Cogitatively Adv.
- Cognisably Adv.
- Cognitively Adv.
- Cognizably Adv.
- Cogradiently Adv.
- Coherently Adv.
- Cohesively Adv.
- Cohomologically Adv.
- Cohomologously Adv.
- Coilingly Adv.
- Coincidentally Adv.
- Coitally Adv.
- Cold Adj. Subst. Adv.
- Coldly Adv.
- Collaboratively Adv.
- Collaterally Adv.
- Collect Verb Subst. Adj. Adv.
- Collectedly Adv.
- Collectionwise Adv.
- Collectively Adv.
- Collegially Adv.
- Colloidally Adv.
- Colloquially Adv.
- Collusively Adv.
- Colonially Adv.
- Colorably Adv.
- Colorfully Adv.
- Colossally Adv.
- Colourably Adv.
- Colourfully Adv.
- Columnwise Adv. Adj.
- Combatively Adv.
- Combinatorially Adv.
- Combustibly Adv.
- Combustively Adv.
- Comely Adj. Adv.
- Comfortably Adv.
- Comfortingly Adv.
- Comically Adv.
- Commemoratively Adv.
- Commendably Adv.
- Commendatorily Adv.
- Commensurably Adv.
- Commensurately Adv.
- Commercially Adv.
- Commiseratively Adv.
- Committedly Adv.
- Commodiously Adv.
- Commonly Adv.
- Communally Adv.
- Communicably Adv.
- Communicatively Adv.
- Communistically Adv.
- Commutatively Adv.
- Compactly Adv.
- Companionably Adv.