puzzling
verb
Meaning
To perplex (someone).
To think long and carefully, in bewilderment.
"We puzzled over the curious-shaped lock, but were unable to discover how the key should be inserted."
To make intricate; to entangle.
noun
Meaning
Time spent pondering something confusing.
adjective
Meaning
Difficult to understand or explain; enigmatic or confusing; perplexing.