Tending to avoid commitment; lacking certainty or decisiveness; reluctant to give out information or show one's feelings or opinion.

One who pickles food products. / A cucumber grown for pickling. / A machine that pickles metal. / (programming) (in the Python programming language) A program or algorithm that performs serialization.

(obsolete) Someone entrusted with a secret; a confidant. / (obsolete) Someone employed as a scribe for personal correspondence.

plural of Hawaiian haystack