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Douglas Harper's Etymology Dictionary
unmastered

1560s, from un- (1) "not" + past participle of master (v.).

Wiktionary
unmastered

a. Not mastered.

Usage examples of "unmastered".

His whole attention, his whole being, is down there, engaged in a life-and-death battle with the terrible apparitions of unmastered psychological energies -- which, it would appear, is exactly what the potential shaman also is doing in the period of his visionary journey.

For unmastered passions enslave us to those who control what we imagine will satisfy them.

Or was it delight unmastered, and awe indefinable, that paralyzed him?

That she was the proud victim of calumny, enkindled by unmastered emotions, merely enhanced her with an air of melancholy sophistication.

The untidy, unmastered, lovely sprawl of the forest put her in context.

She sat leaning forward a little with her hands fallen into her lap, letting her unmastered thoughts play as they would in memories and hopes around the consciousness that she was the happiest girl in the world, and blest beyond desire or desert.

And as always, the alien language, unmastered and struggled over, created a strange concatenation of distance and immediacy.

In your own family you have an excellent example of the idea of self-destruction being suggested during sleep, and carried into action during the first confused, unmastered moments of waking.

There is no trace in his poetry of raw, unmastered, merely recorded, emotion: the sentimental experience is always completely transformed.

There was danger of attack by the yet unmastered U-boats during the ocean passage, and while unloading.

It was feline: it was sa'Rrahh indeed, in the fullness of Her fury, the Mistress of the Unmastered Fire, intent on their destruction.