From Longman Dictionary of Contemporary Englishindefinablein‧de‧fi‧na‧ble /ˌɪndɪˈfaɪnəbəl◂/ adjective DESCRIBEan indefinable feeling, quality etc is difficult to describe or explain She felt an indefinable sadness. —indefinably adverb
Examples from the Corpus
indefinable• And yet about him there hung the indefinable air of ugliness.• In coming here, he was actually following psychic instinct, an indefinable but insinuating impulse to visit the court of Voronov-Vaux.• Because of its name and that pale blue the school enjoyed a peculiar indefinable distinction.• More and more the soldiers felt a certain indefinable malaise during their brief periods of leave at home.• Moore's view is that it is a simple and therefore indefinable property.• She felt a sudden indefinable sadness.• You learn to recognise them through experience; it's often an indefinable something that's lacking.• That has something to do with the indefinable thing called talent.• The air in here was personalized and unhealthy in an indefinable way. 