Some students are optimistic. Some students are overconfident.
Good is an adjective, and words that modify adjectives are called adverbs.
Some adverbs that modify good:
ableaccessibleaccomplishedacrobaticactiveadequateadmirableadorableaffectionateagreeablealluringaltruisticamazingambitiousamiableamicableamusingangelicappreciativeartisticastonishingastoundingastuteathleticattractiveawesome
keenkindkindheartedklutzyknowledgeablekooky
merry
· kindly
kiddy
ableaccessibleaccomplishedacrobaticactiveadequateadmirableadorableaffectionateagreeablealluringaltruisticamazingambitiousamiableamicableamusingangelicappreciativeartisticastonishingastoundingastuteathleticattractiveawesome
imaginativeimpartialimpatientimportantincredibleindependentindignantindistinguishableindustriousinsightfulinspiringintelligentirresistible
· youthful
quaintqualifiedqualityqueenlyquickquietquirky
eagerentertainingexcited
talentedtalltametastefultastytenderterrificthoughtfultremendoustruetrustworthytruthfultwinkly
handsomehandyhappyhelpfulheroichonesthonorablehopefulhumblehumorous
dapperdaringdarlingdashingdecisivedeliciousdelightfuldetermineddiligentdiscreetdivinedreamy
keenkindkindheartedklutzyknowledgeablekooky
naturalneatneighborlyniceniftynimblenoblenormalnotablenurturing
youngyouthful
fabulousfaithfulfascinatingfashionablefaultlessfearlessflawlessfunny