think nothing of

think nothing of (third-person singular simple present thinks nothing of, present participle thinking nothing of, simple past and past participle thought nothing of)

1. To consider as straightforward or normal an activity or situation others regard as unusual, wrong, or difficult.

   I had seen that my neighbours' door was open, but I thought nothing of it at the time, until I heard their house had been broken into.

   • 2021 December 29, Stephen Roberts, “Stories and facts behind railway plaques: Chester (1848)”, in RAIL, number 947, page 57:

     He also thought nothing of laying down a railway in a war zone. For example, he was one of those behind the Grand Crimean Central Railway, built during the Crimean War [...].

• think nothing of it (phrase)

• “think nothing of”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.