Trembling is a related term of feeble.

As verbs the difference between trembling and feeble

is that trembling is while feeble is (obsolete) to make feeble; to enfeeble.

As a noun trembling

is a tremble.

As an adjective feeble is

deficient in physical strength; weak; infirm; debilitated.

Obligation is a related term of strain.

As nouns the difference between obligation and strain

is that obligation is the act of binding oneself by a social, legal, or moral tie to someone while strain is (obsolete) treasure or strain can be the act of straining, or the state of being strained.

As a verb strain is

(obsolete) to hold tightly, to clasp.

Involved is a related term of perplexing.

As adjectives the difference between involved and perplexing

is that involved is complicated while perplexing is confusing or puzzling.

As verbs the difference between involved and perplexing

is that involved is (involve) while perplexing is .

Provision is a related term of qualification.

As nouns the difference between provision and qualification

is that provision is provision while qualification is a clause or condition which qualifies something; a modification, a limitation.

Plague is a related term of rile.

As verbs the difference between plague and rile

is that plague is while rile is to make angry.

Smear is a related term of obloquy.

As nouns the difference between smear and obloquy

is that smear is a mark made by smearing while obloquy is abusive language.

As a verb smear

is to spread (a substance, especially one that colours or is dirty) across a surface by rubbing.

Incidents is a related term of design.

As nouns the difference between incidents and design

is that incidents is while design is design (creative profession or art).

Avenue is a related term of portal.

As nouns the difference between avenue and portal

is that avenue is a broad street, especially one bordered by trees () while portal is portal (grandiose and often lavish entrance).

Rationale is a related term of tenor.

As nouns the difference between rationale and tenor

is that rationale is an explanation of the basis or fundamental reasons for something while tenor is tenor.

Challenge is a related term of charm.

As verbs the difference between challenge and charm

is that challenge is while charm is to seduce, persuade or fascinate someone or something.

As a noun charm is

an object, act or words believed to have magic power or charm can be the mixed sound of many voices, especially of birds or children.