relentless

As adjectives the difference between inflexible and relentless

is that inflexible is not flexible; not capable of bending or being bent; stiff; rigid; firm; unyielding while relentless is unrelenting or unyielding in severity.

Vehement is a related term of relentless.

As adjectives the difference between vehement and relentless

is that vehement is vehement while relentless is unrelenting or unyielding in severity.

As adjectives the difference between relentless and enraged

is that relentless is unrelenting or unyielding in severity while enraged is angered, made furious, made full of rage.

As a verb enraged is

past tense of enrage.

As adjectives the difference between relentless and barbarous

is that relentless is unrelenting or unyielding in severity while barbarous is not classical or pure.

Unswerving is a related term of relentless.

As adjectives the difference between unswerving and relentless

is that unswerving is not deviating; not yielding or straying or varying while relentless is unrelenting or unyielding in severity.

As adjectives the difference between bestial and relentless

is that bestial is beast-like while relentless is unrelenting or unyielding in severity.

Fierce is a related term of relentless.

As adjectives the difference between fierce and relentless

is that fierce is extremely violent, severe, ferocious or savage while relentless is unrelenting or unyielding in severity.

Relentless is a related term of fell.

As an adjective relentless

is unrelenting or unyielding in severity.

As a noun fell is

fur, pelt (hairy skin of an animal).

As adjectives the difference between relentless and unshakeable

is that relentless is unrelenting or unyielding in severity while unshakeable is not able to be shaken; firm, solid, resolute.

Stern is a related term of relentless.

As a noun stern

is a star; a small luminous dot that can be seen on the night sky.

As an adjective relentless is

unrelenting or unyielding in severity.