Describes something fastened, tied, wrapped, or held without much tension. In everyday speech, 緩い is often the simpler direct word for 'loose,' while 緩やか can sound a little more measured or formal.
Please wrap the bandage loosely.
ひもを緩やかに結んだ。
I tied the string loosely.
Used for slopes, curves, flows, speeds, and changes that are not steep, sharp, sudden, or rapid. Common in phrases such as 緩やかな坂, 緩やかなカーブ, and 緩やかに回復する.
緩やかな坂を上っていく。
We go up a gentle slope.
川は緩やかに流れている。
The river is flowing slowly.
景気は緩やかに回復している。
The economy is recovering gradually.
Used of rules, standards, restrictions, or supervision that are not strict. Depending on context it may be neutral-positive, as in flexible policy, or negative, as in lax standards.
この学校は校則が緩やかだ。
This school has lenient rules.
審査基準が緩やかすぎるという批判が出た。
There was criticism that the screening standards were too lax.
This road forms a gentle slope.
The mountain road continues with gentle curves.
The economy is gradually recovering.
This country's environmental regulations are lenient.
I tied the ribbon loosely.
This river's current is gentle.
厳しい means 'strict,' the opposite of 緩やか when describing rules, standards, or supervision.
緩やか describes something gradual or gentle, the opposite of the abruptness implied by 俄.
緩やか describes a gentle, gradual change, the opposite of the steep, drastic change described by 急激.
緩やか describes something gradual or gentle, the opposite of 急速, which describes something rapid or swift.
緩やか describes a gradual, gentle change, the opposite of a ドラスチック (drastic, abrupt) one.