Ungainly means awkward and clumsy in movement. An ungainly walk, ungainly and tall, an ungainly machine.
It describes how something moves rather than how it looks standing still. The gainly in it is a lost word meaning graceful or handy, from an Old Norse root — so ungainly survives without its positive, like unkempt and disgruntled.
1adjectiveungainlyAwkward and clumsy in movement.
“The newborn foal took a few ungainly steps on its long, wobbly legs.”
ungainly is a quality of movement.
Un- plus gainly, a lost word meaning graceful or convenient, from Old Norse gegn, serviceable.
Old Norse
gegn — fit, serviceable; direct, straight; honest; kindly
English, today
ungainly
Built from
From un + gainly (from gain (“dexterous; convenient, easy, handy; suitable”), from Old Norse gegn (“fit, serviceable; direct, straight; honest; kindly”) + -ly). Compare Norwegian Nynorsk ugjegnleg (“stubborn; troublesome”).
Etymology from Wiktionary, CC BY-SA