ペラいalso: ぺらいペラいConjugationMeanings1i-adjectivevery thin; flimsy; cheap; shallowcolloquialColloquial adjective derived from 薄っぺらい. Describes something physically thin and flimsy, or metaphorically shallow and cheap.See also: 薄っぺらいこの紙かみ、ペラいからすぐ破やぶれそう。This paper is so thin it looks like it'll tear right away.