Instinctively

Fish instinctively know how to swim; most humans don't.

She loved him so passionately, and he was so godlike in her eyes; and being, though untrained, instinctively refined, her nature cried for his tutelary guidance.

'I am, perhaps, overgreedy, but I sense a good cook instinctively.'

While Conservative and Labour MPs instinctively had deep political differences, they were united in the cold view that at the end of the 1950s, Britain's railways were friendless and almost finished.