変わり身が早い。の英語

Quick to adapt to changing circumstances.

a rapid change in brightness

The situation has changed dramatically.

He has winged heels.

an imperceptible change

a capricious wind

He is quick at repartee―ready at repartee.

The stream is rapid

The current is swift.

He walks at a quick pace―walks briskly.

It easily catches fire.

being somewhat early

There is a lot of variance.

It was time for a change.

a glacial change

The sooner, the better.

It changed in an instant.

That is significantly changing.

to be swift-footed―swift of foot―fleet of foot―a fast walker―a fast runner

to be swift of foot―fleet of foot

He is swift of foot.

terrestrially changeable

The pulse is quick

The pulse is short.

Times have changed.

more early than

First come, first served.

Times have [are] changed.

an almost insensible change

to change as time passes

Quick to adapt to changing circumstances.