From Middle English calwe (“bald”), from Old English calu (“callow, bare, bald”), from Proto-Germanic *kalwaz (“bare, naked, bald”), from Proto-Indo-European *galw-, *gAlw- (“naked, bald”). Cognate with West Frisian keal (“bald”), Dutch kaal (“bald”), German kahl (“bald”), Russian голый (gólyj, “nude”), Latin calvus (“bald”); cf. also Persian کل (kal).
- (obsolete) Bald.
- Unfledged (of a young bird).
- And in the leafy summit spy'd a nest, / Which, o'er the callow young, a sparrow pressed.
- Immature, lacking in life experience.
- Those three young men are particularly callow youths.
- Lacking color or firmness (of some kinds of insects or other arthropods, such as spiders, just after ecdysis). Teneral.
- Shallow or weak-willed.
- Unburnt (of a brick)
- A callow young bird.
- A callow or teneral phase of an insect or other arthropod, typically shortly after ecdysis, while the skin still is hardening, the colours have not yet become stable, and as a rule, before the animal is able to move effectively.