nouninformal , chiefly Australian/New Zealand & Canadian
1A person lacking spirit or self-confidence; a coward.
- He was impatient with bores, sooks and nags; he was full of ideas and energies, and hopeless at small details.
- Apparently tall thin men who have lost an arm in a machinery accident are not sooks.
- I can be a moper and a downright sook if left to my own devices at times.
mid 19th century: dialect variant of the noun suck.