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Instinctually (adverb)
In an instinctual way.
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Instinctively (adverb)
Innately; by instinct; without being taught.
“Fish instinctively know how to swim; most humans don’t.”
Wiktionary
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Instinctually (adverb)
in a way that relates to an innate, typically fixed pattern of behaviour; by instinct
“I knew instinctually that I had to get out”
“the ant instinctually tries to fulfil the needs of its community”
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Instinctively (adverb)
without conscious thought; by natural instinct
“Elizabeth reacted instinctively in giving him a hug”
“some people know instinctively what suits them”
Oxford Dictionary