This is the 5003rd most frequent Japanese word.
緩い
Loose; lenient; mild; relaxed.
Here, '緩い' describes the physical looseness or slackness of the shoe laces.
この靴ひもは緩いので、固く結び直してください。
These shoe laces are loose, so please tie them tightly again.
In this sentence, '緩い' refers to the leniency or flexibility of the rule.
この規則は緩いから、誰でも簡単に守れます。
This rule is lenient, so anyone can easily follow it.
Here, '緩い' is used to describe the slow and gentle nature of the river's flow.