optimistic
Great Leap Forward
Leibnizian
advance
advancement
amelioration
amendment
arsis
ascent
bar beat
beat
bettering
betterment
boost
bout
bright
buoyant
cheerful
chiliastic
circle
circuit
couleur de rose
course
cycle
diastole
downbeat
encouraging
enhancement
enrichment
eugenics
euthenics
favorable
fond
furtherance
headway
heartening
improvement
lift
light-hearted
melioration
mend
mending
millenarian
millennialistic
offbeat
perfectibilitarian
perfectionist
pickup
positive
preferment
musical rhythm
rhythm
ambivalent
approachable
bouncy
carefree
catchy
chatty
cheery
chipper
companionable
easygoing
even-tempered
jocular
jokey
low-key
outgoing
pessimistic
resilient
sanguine
sociable
vivacious