Greek Strong's Dictionary with all the Synonyms inserted into the definitions.
Greek Synonyms inserted into Greek Strong's Dictionary
0884 + unthankful + unto the unthankful +/ . acharistos {ach-ar'-is-tos}; from 0001 + Alpha (as a negative particle) and a presumed derivative of 5483 + gave + he gave + deliver + forgave + I forgave + forgiving + hath given + he forgave + ye forgive + to forgive + to deliver + freely give + hath forgiven + him and given + to be granted + and forgiving + to you forgive + thing I forgive + I shall be given + with him having forgiven + For unto you it is given + the things that are freely given +/ ; thankless, i .e . ungrateful: --unthankful .