lummox

don't be such a lummox; think before you act.

he tripped over his own feet like a lummox.

she called him a lummox for forgetting their anniversary.

stop acting like a lummox and help me with this task.

even a lummox can learn to ride a bike with practice.

he may be a lummox, but he has a good heart.

she felt like a lummox trying to dance at the party.

don't be a lummox; just ask for help if you need it.

he made a lummox of himself during the presentation.

being a lummox isn't a crime, but it can be embarrassing.