"indefinable" in the adjective sense
1. indefinable, undefinable
not capable of being precisely or readily described not easily put into words
"an indefinable feeling of terror"
"an abstract concept that seems indefinable"
2. indefinable, indescribable, ineffable, unspeakable, untellable, unutterable
defying expression or description
"indefinable yearnings"
"indescribable beauty"
"ineffable ecstasy"
"inexpressible anguish"
"unspeakable happiness"
"unutterable contempt"
"a thing of untellable splendor"
Source: WordNet® (An amazing lexical database of English)
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