insouciant

Imperturbable is a related term of insouciant.

As adjectives the difference between imperturbable and insouciant

is that imperturbable is not easily perturbed, upset or excited while insouciant is carefree, nonchalant, indifferent; casually unconcerned.

As adjectives the difference between insouciant and idle

is that insouciant is carefree, nonchalant, indifferent; casually unconcerned while idle is empty, vacant.

As a verb idle is

to spend in idleness; to waste; to consume.

Unaffected is a related term of insouciant.

As adjectives the difference between unaffected and insouciant

is that unaffected is not affected or changed while insouciant is carefree, nonchalant, indifferent; casually unconcerned.

As a noun unaffected

is someone not , as by a disease.

As adjectives the difference between blase and insouciant

is that blase is an alternative spelling of blasé|lang=en while insouciant is carefree, nonchalant, indifferent; casually unconcerned.

As a proper noun Blase

is a given name derived from Latin.

Casual is a related term of insouciant.

As adjectives the difference between casual and insouciant

is that casual is happening by chance while insouciant is carefree, nonchalant, indifferent; casually unconcerned.

As a noun casual

is (british|nz) a worker who is only working for a company occasionally, not as its permanent employee.

Unexcited is a related term of insouciant.

As adjectives the difference between unexcited and insouciant

is that unexcited is (nonstandard) not excited while insouciant is carefree, nonchalant, indifferent; casually unconcerned.

Insouciant is a related term of careless.

As adjectives the difference between insouciant and careless

is that insouciant is carefree, nonchalant, indifferent; casually unconcerned while careless is (lb) free from care; unworried, without anxiety.

Insouciant is a related term of lethargic.

As adjectives the difference between insouciant and lethargic

is that insouciant is carefree, nonchalant, indifferent; casually unconcerned while lethargic is sluggish, slow.

As adjectives the difference between insouciant and airy

is that insouciant is carefree, nonchalant, indifferent; casually unconcerned while airy is consisting of air; as, an airy substance; the airy parts of bodies.

Unruffled is a related term of insouciant.

As adjectives the difference between unruffled and insouciant

is that unruffled is calm, not ruffled, serene, at peace, unbothered while insouciant is carefree, nonchalant, indifferent; casually unconcerned.