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Webster 1913 Edition

Adj.

Containing a plaint; complaining; expressing sorrow with an audible voice.

“My plaintful tongue.”

Sir P. Sidney.

Adj.

Complaining; expressing sorrow with an audible voice; as my plaintful tongue.

plaintful ‎(comparative more plaintful, superlative most plaintful)

(obsolete) complaining; expressing sorrow audibly
My plaintful tongue. — Sir Philip Sidney.