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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
THESAURUS

WORDNET DICTIONARY

Adverbial reasonably has 2 senses

• reasonably(r = adv.all) fairly, jolly, middling, moderately, passably, pretty, somewhat - to a moderately sufficient extent or degree; "pretty big"; "pretty bad"; "jolly decent of him"; "the shoes are priced reasonably"; "he is fairly clever with computers"
Antonym: unreasonably

• reasonably(r = adv.all) sanely, sensibly - with good sense or in a reasonable or intelligent manner; "he acted sensibly in the crisis"; "speak more sanely about these affairs"; "acted quite reasonably"
Antonym: unreasonably

CIDE DICTIONARY

THESAURUS

reasonably

analytically, artfully, astutely, at a bargain, at a sacrifice, at budget prices, at cost, at cost price, at piggy-bank prices, at prime cost, at reduced rates, at small cost, at wholesale, cheap, cheaply, circumspectly, cleverly, considerately, cunningly, discerningly, discreetly, for a song, for pennies, in all conscience, in all reason, in reason, inexpensively, intelligently, judiciously, knowingly, logically, moderately, nominally, on the cheap, providently, prudently, rationally, sagaciously, sanely, sensibly, shrewdly, smartly, soundly, syllogistically, thoughtfully, understandingly, wholesale, wisely, within bounds, within reason, within reasonable limitations

For further exploring for "reasonably" in Webster Dictionary Online