at random

Từ điển WordNet v3.1 - WordNet Dictionary

adverb

in a random manner (Freq. 1)
- the houses were randomly scattered
- bullets were fired into the crowd at random
• Syn:
randomly, indiscriminately, haphazardly, willy-nilly, arbitrarily, every which way
• Derived from adjective:
haphazard (for: haphazardly), indiscriminate (for: indiscriminately), random (for: randomly)