Hollow means having an empty space inside it; shallow means having very little depth from the surface down. The old oak was hollow, so the children hid inside it. The pool is shallow enough to stand up in at the far end. Hollow is about what is inside; shallow is about how far down it goes.
The core difference
Picture a chocolate Easter egg and a baking tray. The egg is hollow — solid on the outside, empty within, with the emptiness sealed in. The tray is shallow — it holds something, but only just, because the distance from rim to base is small.
That is the whole distinction. Hollow describes a cavity enclosed by material. Shallow describes a small vertical measurement.
How to use each
- Bones are hollow in most birds, which keeps them light.
- He knocked on the wall and it sounded hollow.
- The stream is shallow here — you can walk across.
- Serve it in a wide, shallow bowl.
- Even a shallow scratch on the lens will show up in photographs.
The test you can run
Ask: could something be inside it, hidden from view? If yes, the word is hollow. Then ask: could you measure it from top to bottom and get a small number? If that is what you mean, the word is shallow.
A bowl is shallow, not hollow, because nothing is concealed — you can see straight in. A ball is hollow, not shallow, because the space is enclosed and depth is not the point.
The figurative senses
Both words are used about people and ideas, and here they mean different criticisms.
- Hollow = empty of real content or feeling. A hollow apology is one with nothing sincere behind it. A hollow victory costs you so much that winning means little. A hollow laugh has no amusement in it.
- Shallow = lacking depth of thought or feeling. A shallow person cares only about surface things. A shallow analysis skims the topic without getting into it.
The difference matters: calling an argument hollow says it is empty and false; calling it shallow says it is real but underdeveloped. You can fix a shallow argument by digging further. A hollow one has nothing to dig for.
Where people go wrong
The commonest slip is using hollow for a container that is simply not deep: "a hollow dish" when you mean a shallow one. Every open container has a space inside it, so hollow adds nothing there and sounds odd.
Watch the noun forms too. A hollow can be a small valley or a dip in the ground ("a hollow between the hills"), and the verb hollow out means to remove the inside of something. Shallow has no common verb; its plural noun form, the shallows, means the part of a body of water where it is not deep.
Frequently Asked Questions
Is a bowl hollow or shallow?
Shallow, if you mean it is not very deep. <em>Hollow</em> implies an enclosed cavity, so it suits a chocolate egg or a tree trunk rather than an open dish you can see straight into.
What's the difference between a hollow person and a shallow person?
A shallow person is interested only in surface things and does not think deeply. A hollow person seems to have nothing genuine inside at all — the word suggests emptiness or a facade rather than mere superficiality.
Can something be both hollow and shallow?
Yes, though it is unusual. A thin plastic tray moulded with a small enclosed rim could be described as hollow in construction and shallow in depth — but in most sentences one of the two words is clearly the one you want.