Erratically and Certainly

erratically

In an erratic unpredictable manner.
- usage: "economic changes are proceeding erratically"
- synonyms: unpredictably

certainly

Definitely or positively (`sure' is sometimes used informally for `surely'. )
- usage: "the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll win sure as shooting"; "they sure smell good"; "sure he'll come"
- synonyms: surely, sure, for sure, for certain, sure enough, sure as shooting

(adv.) Without doubt or question; unquestionably.

Webster's Revised Unabridged Dictionary