Cheap; inexpensive — having a low price or cost.
このシャツはデパートの割に安いね。
This shirt is cheap for a department store.
まとめ買いすると一つ当たりが安くなる。
If you buy in bulk, the price per item becomes cheaper.
値段が安すぎて品質が心配だ。
The price is so low that I'm worried about the quality.
Calm; peaceful — a literary/archaic sense meaning emotionally calm or tranquil (mainly seen in classical/literary contexts).
古い和歌では『安い』が心の平穏を表すことがある。
In old waka poetry, '安い' sometimes expresses inner tranquility.