Erratically and Stably

adverb

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

adverb

• In a stable solid fixed manner.
  • usage: "the boulder was balanced stably at the edge of the canyon"
• In a stable unchanging manner.
  • usage: "the death rate in Russia has been stably high"

(adv.) In a stable manner; firmly; fixedly; steadily; as, a government stably settled.