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Webster 1913 Edition

adv.

In a vain manner; in vain.

, adv.

Without effect; to no purpose; ineffectually; in vain.

In weak complaints you vainly waste your breath.

Boastingly; with vaunting; proudly; arrogantly.

Humility teaches us not to think vainly nor vauntingly of ourselves.

Idly; foolishly.

Nor vainly hope to be invulnerable.

vainly ‎(comparative more vainly, superlative most vainly)

in vain