rigid

Vertical is a related term of rigid.

As adjectives the difference between vertical and rigid

is that vertical is along the direction of a plumbline or along a straight line that includes the center of the earth while rigid is rigid.

As a noun vertical

is a vertex or zenith.

Rooted is a related term of rigid.

As adjectives the difference between rooted and rigid

is that rooted is fixed in one position; immobile; unable to move while rigid is rigid.

As a verb rooted

is (root).

Reserved is a related term of rigid.

As adjectives the difference between reserved and rigid

is that reserved is (comparable) slow to reveal emotion or opinions while rigid is rigid.

As a verb reserved

is (reserve).

Stationary is a related term of rigid.

As adjectives the difference between stationary and rigid

is that stationary is not moving while rigid is rigid.

As a noun stationary

is one who, or that which, is stationary, such as a planet when apparently it has neither progressive nor retrograde motion.

Rigid is a related term of closely.

As an adjective rigid

is rigid.

As an adverb closely is

in a close manner.

As a noun tigh

is (obsolete) a close or enclosure; a croft.

As an adjective rigid is

rigid.

As adjectives the difference between cool and rigid

is that cool is having a slightly low temperature; mildly or pleasantly cold while rigid is stiff, rather than flexible.

As a noun cool

is a moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness.

As a verb cool

is to lose heat, to get colder.

As an acronym COOL

is CLIPS Object-Oriented Language