"perceptible" in the adjective sense
1. perceptible
capable of being perceived by the mind or senses
"a perceptible limp"
"easily perceptible sounds"
"perceptible changes in behavior"
"a perceptible sense of expectation in the court"
2. detectable, perceptible
easily seen or detected
"a detectable note of sarcasm"
"he continued after a perceptible pause"
Source: WordNet® (An amazing lexical database of English)
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