subtle

As adjectives the difference between flexible and subtle

is that flexible is capable of being flexed or bent without breaking; able to be turned, bowed, or twisted, without breaking; pliable; not stiff or brittle while subtle is hard to grasp; not obvious or easily understood; barely noticeable.

As a noun flexible

is (chiefly|engineering|and|manufacturing) something that is flexible.

As a noun elegance

is elegance.

As an adjective subtle is

hard to grasp; not obvious or easily understood; barely noticeable.

As adjectives the difference between subtle and reserved

is that subtle is hard to grasp; not obvious or easily understood; barely noticeable while reserved is (comparable) slow to reveal emotion or opinions.

As a verb reserved is

(reserve).

As adjectives the difference between subtle and harsh

is that subtle is hard to grasp; not obvious or easily understood; barely noticeable while harsh is unpleasantly rough to the touch or other senses.

As a verb harsh is

(slang) to negatively criticize.

As adjectives the difference between subtle and noisy

is that subtle is hard to grasp; not obvious or easily understood; barely noticeable while noisy is making a noise, especially a loud sound; clamorous; vociferous; turbulent; boisterous; as, the noisy crowd.

As adjectives the difference between subtle and forthright

is that subtle is hard to grasp; not obvious or easily understood; barely noticeable while forthright is straightforward; not evasive; candid and direct.

As adjectives the difference between subtle and smooth

is that subtle is hard to grasp; not obvious or easily understood; barely noticeable while smooth is having a texture that lacks friction not rough.

As an adverb smooth is

smoothly.

As a noun smooth is

something that is , or that goes smoothly and easily.

As a verb smooth is

to make smooth or even.

As adjectives the difference between immaterial and subtle

is that immaterial is having no matter or substance while subtle is hard to grasp; not obvious or easily understood; barely noticeable.

As adjectives the difference between subtle and false

is that subtle is hard to grasp; not obvious or easily understood; barely noticeable while false is (label) one of two states of a boolean variable; logic.

As a noun tact

is the sense of touch; feeling.

As a verb tact

is (psychology) to use a tact (a kind of verbal operant; see noun sense).

As an adjective subtle is

hard to grasp; not obvious or easily understood; barely noticeable.