i-adjective
yellowish; tinged with yellow
Describes something that is not pure yellow but has a yellow tint. Often used for colors of objects, skin, or liquids.
この壁は黄色っぽい色だ。
This wall is a yellowish color.
古い紙は黄色っぽくなっている。
The old paper has become yellowish.
黄色い means 'yellow', while 黄色っぽい means 'yellowish' or 'tinged with yellow', indicating a less pure or less intense yellow.
Formed from 黄色 (きいろ, 'yellow') + the suffix っぽい (-ppoi, '-ish, -like'). The suffix っぽい attaches to nouns and adjective stems to express a tendency or resemblance.