Dictionary

think nothing of en · VERB

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

Spelling	Features	Source
thinks nothing of	Number=Sing, Person=3, Tense=Pres	lexicographic
thought nothing of	Tense=Past, VerbForm=Part	lexicographic
thought nothing of	Tense=Past	lexicographic
thinking nothing of	Tense=Pres, VerbForm=Part	lexicographic