stolid

As a noun sold

is income of a soldier, conscripts in military or other national service, and certain other professions.

As an adjective stolid is

having or revealing little emotion or sensibility.

As adjectives the difference between unshakable and stolid

is that unshakable is that cannot be shaken or moved; unfaltering or unwavering while stolid is having or revealing little emotion or sensibility.

As adjectives the difference between stolid and steadfast

is that stolid is having or revealing little emotion or sensibility while steadfast is fixed or unchanging; steady.

As adjectives the difference between stolid and undefined

is that stolid is having or revealing little emotion or sensibility while undefined is lacking a definition or value.

As adjectives the difference between stolid and conventional

is that stolid is having or revealing little emotion or sensibility while conventional is pertaining to a convention, as in following generally accepted principles, methods and behaviour.

As a noun conventional is

(finance) a conventional gilt-edged security, a kind of bond paying the holder a fixed cash payment (or coupon) every six months until maturity, at which point the holder receives the final payment and the return of the principal.

As adjectives the difference between stolid and sunny

is that stolid is having or revealing little emotion or sensibility while sunny is (of weather or a day) featuring a lot of sunshine.

As an adverb sunny is

(us|regional) sunny side up.

As a noun sunny is

a sunfish.

As adjectives the difference between stolid and diffident

is that stolid is having or revealing little emotion or sensibility while diffident is (archaic): lacking confidence in others; distrustful.

As adjectives the difference between stolid and nonchalant

is that stolid is having or revealing little emotion or sensibility while nonchalant is casually calm and relaxed.