levity
earnest
lightheaded
airheaded
featherbrained
insincere
silly
light-headed
dizzy
empty-headed
giddy
solemness
solemnity
sedateness
staidness
grave
lighthearted
nonseriousness
half-heartedly
unserious
insincerely
insubstantive
unfeigning
tacitly
nonsubstantive
make light of
earnestness
meretriciously
flashily
unfacetious
light-handed
disingenuous
sulk
humorlessly
artful
balkingly
flip
mien
unengagingly
needlessly
meaninglessly
comportment
presence
bearing
unhumorously
unphrasable
low-heartedly
inaptly
undignifying
unappealingly
mailed-in
unenthusiastically
unhumoured
playingly
distastefully
lackadaisically
unearnest
no-nonsensely
pro forma
prosy
witlessly
uningeniously
pedestrian
oleaginous
white lie
earthbound
unassertively
prosaic
perfunctorily
throwaway
unfeigned
genuine
meanly
humbly
simple-heartedness
unmeaningful
gaucheness
niggardly
unpretended
halfwittedly
unhelpfully
crudity
true
crudeness
joke
infelicitous
nonmeaningful
unwitty
chalance
humorless
undiplomatic
insignificative
dismissively
underarticulated
wistfully
unexpressively
unessayed
earnest
lightheaded
airheaded
featherbrained
insincere
silly
light-headed
dizzy
empty-headed
giddy
grave
lighthearted
unserious
insubstantive
unfeigning
nonsubstantive
unfacetious
light-handed
disingenuous
artful
flip
unphrasable
undignifying
mailed-in
unhumoured
unearnest
prosy
pedestrian
oleaginous
earthbound
prosaic
throwaway
unfeigned
genuine
unmeaningful
niggardly
unpretended
true
infelicitous
nonmeaningful
unwitty
humorless
undiplomatic
insignificative
underarticulated
unessayed
half-heartedly
insincerely
tacitly
meretriciously
flashily
humorlessly
balkingly
unengagingly
needlessly
meaninglessly
unhumorously
low-heartedly
inaptly
unappealingly
unenthusiastically
playingly
distastefully
lackadaisically
no-nonsensely
pro forma
witlessly
uningeniously
unassertively
perfunctorily
meanly
humbly
halfwittedly
unhelpfully
dismissively
wistfully
unexpressively
levity
solemness
solemnity
sedateness
staidness
nonseriousness
earnestness
mien
comportment
presence
bearing
white lie
simple-heartedness
gaucheness
crudity
crudeness
joke
chalance
make light of
sulk
English words for 'a manner lacking seriousness'
As you may have noticed, above you will find words for "a manner lacking seriousness". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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smartly dressed
encapsulation
not knowing what to do
path of duty
street musician
wintering
deck
fawningly.
evil eye
to twinkle.
jack of all trades
A blessing
inhaler
standing motionlessly
behaviorism
to raise one's eyebrows
bedraggled.
admirable.
Sugar cane
point of the compass
Having six angles
frameshift mutation
polycyclic
taking responsibility
TV special
boastful speech
trooper
turn of mind
to be beaten
To rain heavily
to please
a jack.
billfold
Unreliable
low tide
generous.
involuntary
imp
publisher
hurdling
shed
resembling
hour
cosmetics
to subside
spectacle
domestic
previous
hope
elegant