いi-adjective
strong
koi
meaning: is strong
state
feeling
examples
この部屋のカーテン、色が濃いね。
kono heya no kaaten, iro ga koi ne.
The curtains in this room are a dark colour. casual
この店の日本茶は味が濃いです。
kono mise no nihoncha wa aji ga koi desu.
The green tea at this place has a strong flavour. neutral