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Webster 1828 Edition

Adj.

Wanting due proportion.

unproportionable ‎(comparative more unproportionable, superlative most unproportionable)

not proportionable.
- 1662, Henry More, An Antidote Against Atheism, Book II, A Collection of Several Philosophical Writings of Dr. Henry More, p. 53:
  "Wherefore things falling off by degrees from the highest Perfection, it will be no uneven or unproportionable step, if descending from the Top of this outward Creation..."