From BiblePortal Wikipedia

Wilson's Dictionary of Bible Types [1]

 Psalm 141:6 (b) The reference is to the fact that when trouble comes, the way is rough, and the times are hard, then GOD's people will hear GOD's words, and will take heed to His way.

 Ezekiel 11:19 (b) By this word is described that heart which will not be impressed by GOD's Word, and does not respond to GOD's love, nor to His call. (See also  Ezekiel 36:26).

 Matthew 13:5 (a) Jesus thus describes that kind of disposition, or soul, or heart, which sits unmoved under the sound of the Gospel and does not respond in a permanent way. The person seems to be moved a little bit, and shows some interest, but this is not permanent. After while he refuses to return to the church, and avoids meeting the Christians. (See  Matthew 13:20, and  Mark 4:5,  Mark 4:16).

Webster's Dictionary [2]

(1): ( superl.) Converting into stone; petrifying; petrific.

(2): ( superl.) Inflexible; cruel; unrelenting; pitiless; obdurate; perverse; cold; morally hard; appearing as if petrified; as, a stony heart; a stony gaze.

(3): ( superl.) Of or pertaining to stone, consisting of, or abounding in, stone or stones; resembling stone; hard; as, a stony tower; a stony cave; stony ground; a stony crust.

King James Dictionary [3]

Stony, a. G.

1. Made of stone as a stony tower. 2. Consisting of stone as a stony cave. 3. Full of stones abounding with stones as stony ground. 4. Petrifying as the stony dart of senseless cold. 5. Hard cruel unrelenting pitiless as a stony heart. 6. Insensible obdurate perverse morally hard.