English
sinkless
From sink + -less.
Formed from sink + -less
Proto-Indo-European *sengʷ- ‘to fall, sink’
Proto-Germanic *sinkwaną ‘to sink’
Proto-West Germanic *sinkwan ‘to sink’
Old English sincan ‘to sink’
Middle English synken ‘to sink (to embed)’
English sink
Today it means
adj Without a sink (of any kind).
Language periods are conventional ranges, not dates for this word.
Etymograph / sinkless