どうも

Etymology
Derived as compound of. Literal meaning is close to “no matter how, howsoever, in all cases”. Idiomatically and semantically used as an intensifier in specific contexts. Compare.

Adverb

 * 1) no matter how, not at all
 * 2) somehow, something
 * 3) quite, very much
 * 1) quite, very much
 * 1) quite, very much

Interjection

 * 1)  thanks
 * 2)  sorry, excuse me

Usage notes
Expressions of thanks are given below in rough order of casual to polite. Note that gozaimasu changes to gozaimashita when referring to events in the past.

Normally used in polite Japanese. It also adds emphasis, similar to "very" in English.