different between deferential vs regardful

English

deferential (comparative more deferential, superlative most deferential)

Respectful and considerate; showing deference.
Antonyms: derogative, derogatory
Based on deference; based on the doctrine, ideology, or wishes of others rather than one's own conclusions.
(anatomy, not comparable) Of, or relating to the vas deferens.

From regard +? -ful.

regardful (comparative more regardful, superlative most regardful)

Respectful. [from 16th c.]
(now rare) Watchful, observant. [from 16th c.]
- 1596, Edmund Spenser, The Faerie Queene, IV.7:
  And evermore, when with regardfull sight / She looking backe espies that griesly wight / Approching nigh, she gins to mend her pace […].

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