Something that is ~ can only just be seen or noticed.
Pasternak gave him a barely ~ smile...
= discernible
ADJ
perceptibly
The tension was mounting perceptibly.
ADV: ADV with v
Something that is ~ can only just be seen or noticed.
Pasternak gave him a barely ~ smile...
= discernible
ADJ
perceptibly
The tension was mounting perceptibly.
ADV: ADV with v
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012