lively, spirited:
boring,
dispirited,
dull,
unhappy,
unattractive.
noun:
boring,
weary,
dour,
vapid,
defunct,
glum,
inhibited,
deceased,
constrained,
tired,
stoic,
phlegmatic,
leaden,
dispirited,
unambitious,
tedious,
sullen,
inanimate,
morose,
restrained,
repressed,
subdued,
impassive,
apathetic.