uncleavable
Impossible to sever
Unable to be cleaved—that is, resistant to being split, divided, or separated.
The word appears in chemistry and biology for bonds or molecules that cannot be broken by typical reactions: The modified linkage proved uncleavable under standard conditions.
More broadly, it describes anything that resists division: an uncleavable alliance.
Impossible to damage permanently
- unbreakableImpossible to damage
- impenetrableImpossible to pass through
- unyieldingRefusing to give way
- toughDurable and strong
resilient · durable · sturdy · robust · hardened · fortified · reinforced · adamantine
Unable to be divided
- fusedJoined by melting together
- conjoinedAttached, sharing parts
- interlockedJoined by overlapping parts
- weldedJoined metals by melting
bonded · joined · attached · affixed · melded · united · intertwined · inextricable
Crystallized carbon gemstone
- graniteIgneous rock, quartz-rich
- steelCarbon-hardened iron alloy
- titaniumElement twenty-two
- tungstenElement seventy-four
obsidian · quartz · bedrock · marble · basalt · corundum · sapphire · carbide
Element's smallest unit
- monolithicMassive and undifferentiated
- unifiedCombined into one
- singularOne in number
- wholeFull and undivided
entire · complete · integral · undividable · elementary · fundamental · unitary · cohesive
indestructible
Impossible to damage permanently
- unbreakableImpossible to damage
- impenetrableImpossible to pass through
- unyieldingRefusing to give way
tough · resilient · durable · sturdy · robust · hardened · fortified · reinforced · adamantine · impervious
inseparable
Unable to be divided
- fusedJoined by melting together
- conjoinedAttached, sharing parts
- interlockedJoined by overlapping parts
welded · bonded · joined · attached · affixed · melded · united · intertwined · inextricable · enmeshed
diamond
Crystallized carbon gemstone
tungsten · obsidian · quartz · bedrock · marble · basalt · corundum · sapphire · carbide · kevlar
atom
Element's smallest unit
- monolithicMassive and undifferentiated
- unifiedCombined into one
- singularOne in number
whole · entire · complete · integral · undividable · elementary · fundamental · unitary · cohesive · continuous