observable
1. [ adjective ] capable of being seen or noticed
Synonyms: evident discernible
Examples:

"a discernible change in attitude" "a clearly evident erasure in the manuscript" "an observable change in behavior"

Related terms: noticeable
Similar spelling:   observably
  observe
  observance
  observational
  observer
  observed
  observant
  observingly
  observatory
  observation
  observantly
  observing
  observed_fire