Definition of crestless in English:

crestless

adjective

See crest

‘The crestless head is dark green, the bill is red, and the eye is dark.’
  • ‘These crestless firebacks are also very striking birds but are not very common in captivity.’
  • ‘The image is of an adult-size Corinthian crestless helmet which can be used for display or re-enactment purposes.’
  • ‘The Dark-Legged Hanuman Langur, for instance, is a crestless, black-pawed yellowish-white subspecies with a dark grey backward-looped tail.’
  • ‘More often than not, juveniles of species with crests are usually crestless, and they slowly grow the crest in with passing years.’