at a loss(p): filled with bewilderment; "at a loss to understand those remarks"; "puzzled that she left without saying goodbye"
(puzzlement) bewilderment: confusion resulting from failure to understand
(puzzling) enigmatic: not clear to the understanding; "I didn't grasp the meaning of that enigmatic comment until much later"; "prophetic texts so enigmatic that their meaning has been disputed for centuries"
(puzzling) confusing: lacking clarity of meaning; causing confusion or perplexity; "sent confusing signals to Iraq"; "perplexing to someone who knew nothing about it"; "a puzzling statement"
(Puzzlement) Aporia (Ancient Greek: : impasse; lack of resources; puzzlement; doubt; confusion) denotes, in philosophy, a philosophical puzzle or state of puzzlement, and, in rhetoric, a rhetorically useful expression of doubt.
Confused or perplexed
(puzzledly) In a puzzled manner; confusedly
When we can not figure something out, we are _____ about it.