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Webster 1913 Edition

Adj.

Of the nature of an impediment; hindering; obstructing; impeditive.

Things so

impedimental

to success.

G. H. Lewes.

Adj.

Hindering; obstructing.

impedimental ‎(comparative more impedimental, superlative most impedimental)

Of the nature of an impediment; hindering or obstructing.
Things so impedimental to success. — G. H. Lewes.