Noun

A highly poisonous metal

Arsenic trioxide, poison

Medicine

I put some arsenic in their food so that I would never have to talk to them again.

Verb

Making someone happy by doing something for them

Humored, made content

Made unhappy, was mean

When she thanked the workers, it gratified all the hard work that they had done.

Verb

To begin

Begin, start

Stop, end

Let us commence the fairy tale ball!

Verb

To speak out a probable idea

Dare to say, assume

Stay quiet, hush

I daresay, that was the best tea I've ever had.

Noun

The frame surrounding a fireplace

Border, surrounding

Inside of the fireplace

She lined up the children's stockings along the mantel.

Adjective

Shameless, without fear

Shy, reserved

She brazenly described her quest, exaggerating her bravery.

Noun

A formal lunch

Lunch, formal gathering

Unformal, casual brunch

The company held a luncheon to raise money and gain popularity.

Noun

A cloth napkin used to wipe your nose

Napkin

Sandpaper

He wiped his nose on his handkerchief.

Adjective

Sloped

Curved, sloped

Straight, flat

The path was inclined, so it was harder to walk through it.

Adjective

Able to be seen

Visible

Invisible

The bird was barely observable from a distance