Without pleats, ruffles, or gathered decorative folds; plain and unadorned.
Formed from frounced plus the suffix -less, meaning 'without'; creates the opposite of frounced decoration.
A frounceless garment in the Renaissance would have been considered practically boring—it's like showing up to a modern event in plain colors when everyone else is wearing patterns.
Complete word intelligence in one call. Free tier — 50 lookups/day.