Couch potato
A person who spends a lot of time sitting and watching TV.

Burning daylight
Wasting time during the day by being unproductive.

Asleep at the wheel
Not paying attention or not doing one's duties properly.

Drag one's feet
To delay or be slow in doing something.

Lay around
To relax or be lazy without doing anything productive.

Procrastination is the thief of time
Delaying tasks leads to wasted time.

Resting on one’s laurels
Being satisfied with past success and not trying to improve.

Take it easy
To relax and avoid hard work.

Fiddle while Rome burns
To waste time on unimportant things during a crisis.

Laze about
To spend time being lazy or idle.

Too lazy to scratch an itch
Extremely lazy, not willing to put effort even for small tasks.

Let grass grow under one's feet
To be inactive or delay in taking action.

A rolling stone gathers no moss
A person who doesn’t settle doesn’t gain responsibilities, often leading to laziness.

Dead weight
Someone or something that is unproductive or not contributing.

Put off until tomorrow what you can do today
To delay doing tasks that could be completed sooner.

Kick the can down the road
To delay or avoid dealing with a problem.

Sit back and let things happen
To be passive and not take initiative.

Lie low
To avoid work or responsibility.

Shirk one’s duty
To avoid fulfilling one's responsibilities.

Not lift a finger
To not make any effort to help or do something.