weighty

adjective
UK /ˈweɪ.ti/
US /ˈweɪ.t̬i/

Something weighty is very heavy and hard to lift.

The weighty box was too heavy for me to carry alone.


OTHER MEANINGS

2. Very serious and important.

The judge made a weighty decision about the case.

3. Having a strong effect on how people think.

Her weighty words made everyone stop and listen.

4. Large in amount or size.

He carried a weighty stack of books to class.