at random

1. Without order or fixed purpose, haphazardly, as in Jackson Pollock dropped paints on canvas seemingly at random. Originally this phrase meant “very speedily” and “heedlessly.” Shakespeare had the present usage in 1 Henry VI (5:3): “He talks at random; sure the man is mad.” [Late 1500s]

Related Words

• aimlessly 
• frantically 
• indiscriminately 
• instinctively 
• madly 
• wildly www.thesaurus.com