From Wiktionary, the free dictionary
From expression + -ful.
expressionful (comparative more expressionful, superlative most expressionful)
- Full of expression; expressive.
1895, Marshall Mather, Lancashire Idylls, page 39:
In another minute she lay peaceful and motionless under the anæsthetic — a statue, immobile, yet expressionful, as though carved by some master hand.