callow (ornithology, behavior, general)

federlos (a) (ornithology)

unreif (a) (behavior)

sans plumes (a) (ornithology)

immature (a) (behavior)

imberbe (a) (general)

implume (a) (ornithology)

immaturo (a) (behavior)

implume (a) (ornithology)

inmaduro (a) (behavior)

zonder veren (a) (ornithology)

zonder pluimen (a) (ornithology)

onvolwassen (a) (behavior)

fjäderlös (a) (ornithology)

ofjädrad (a) (ornithology)

omogen (a) (behavior)

implume (a) (ornithology)

imaturo (a) (behavior)