AppearanceThe Sombre Greenbul is 15–18 cm long, with mainly dull greyish olive-green plumage, paler on the underparts than above. It has a white iris. The sexes are similar in plumage, but juveniles are even duller than the adult and have dark eyes.
The subspecies ''A. i. hypoxanthus'' is much yellower below than the nominate subspecies.
BehaviorThe Sombre Greenbul is a common bird, which tends to stay hidden in foliage and is more often heard than seen. It is usually found in pairs or small groups foraging for insects, fruit and small snails.
The Sombre Greenbul is a vocal species, and the most typical call is a monotonous, ringing phrase starting with a penetrating single whistle ''weeeewee'', followed by a jumbled chortle and ending off with a rather plaintive, drawn out whistle ''willy''.
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