inconsistently
Examples
The team performed inconsistently throughout the season, winning against top-tier opponents but losing to the bottom-ranked ones.
He has been acting inconsistently lately, which makes it difficult to predict his reaction to the news.
The machine is operating inconsistently, causing the production line to stall every few hours.
Synonyms
erratically unpredictably capriciously fitfully irregularly fluctuatingly sporadically
Antonyms
consistently steadily uniformly reliably constantly predictably regularly