Synonyms for Notwithstanding:

adj.

qualified (adjective)
limited, tempered, provisional, qualified, reserved, Albeit, exceptional, Stipulated, mitigated, conditional.

adv.

however (adverb)
however.
qualifiedly (adverb)
exceptionally, conditionally, Qualifiedly, provisionally, reservedly.

adv

however (adverb)
for all that, Howbeit, nevertheless, withal, after all, on the other hand.
qualifiedly (adverb)
exceptionally, conditionally, Qualifiedly, provisionally, reservedly.

conj.

however (conjunction)
still.

n.

anyway, for all, despite, at least, anyhow, all/just the same, in spite of something. despite (noun)
in any case, at any rate, in any event, regardless of, though, at all events, to the contrary, after all, for all that, on the other hand, although, in spite of, Howbeit.
notwithstanding (noun)
however, all the same, withal, nevertheless, nonetheless, still, even so, yet.

prep.

although, however (preposition)
though, nevertheless, to the contrary, in any case, withal, for all that, in spite of, regardless of, yet, nonetheless, at any rate, in any event, after all, Howbeit, despite, on the other hand.

Other synonyms:

nevertheless
nevertheless.
Other relevant words:
despite, nevertheless, even so, for all that, withal, though, in spite of, for all, still, in any case, at any rate, Howbeit, nonetheless, all the same, however, to the contrary, at all events, anyhow, although, in any event, after all, yet, regardless of, anyway, on the other hand.

Usage examples for notwithstanding

  1. He has a good head, a fine countenance, and a great spirit, notwithstanding his education has been obtained in the horrible school of slavery. – Narrative of the Life of Moses Grandy, Late a Slave in the United States of America by Moses Grandy
  2. And so it happened that, notwithstanding her cordial welcome and her respectful consideration of his criticism, he went away with a feeling of disappointment. – The Captain of the Gray-Horse Troop by Hamlin Garland
  3. If you had told your fathers seventy years ago that all the spinning walks would be done away with and the population better off notwithstanding they would never have believed it. – The Spinners by Eden Phillpotts