Quaffable comes from quaff (of uncertain, possibly imitative origin, 'to drink heartily') + the suffix -able ('capable of'), giving quaffable ('capable of being quaffed; easy to drink'). In current use it is an adjective meaning "easy and pleasant to drink, often referring to wine or other beverages". That sense is explained by the older material without requiring a speculative semantic step: the inherited or borrowed base supplies the field of meaning, while the English formation fixes its modern role. The suffix -able gives the word a sense of capability, fitness, or susceptibility. The surface form is compositional: its joined elements remain visible in the modern word. The uncertainty belongs to the etymology itself and should be kept: the older ancestry is not presented as more secure than it is. The safest dictionary treatment is to keep the secure forms and the uncertainty together, since the doubtful step is part of the word's history rather than a gap to fill by guesswork.