Innermost describes whatever is deepest inside, furthest from the outside, or most private and personal. Your innermost thoughts are the ones you keep completely to yourself, the feelings and ideas you might not share with anyone else. The innermost room of an ancient Egyptian pyramid lies at its very center, protected by layers of stone corridors and chambers.

When explorers discover the innermost cave in a vast underground system, they've reached the deepest point, the place requiring the longest journey inward. When someone shares their innermost fears or dreams with you, they're trusting you with something deeply personal, something from their core.

You might read about the innermost workings of a watch (the tiny gears at its heart) or hear about someone's innermost circle of friends (the people they trust most completely). The innermost part of anything, whether it's a physical place or an emotional space, is always the most protected, the most hidden, and the most essential.