abstruse -- Isabella and Ann

ab·struse (b-strs, b-)

adj.

Difficult to understand; recondite. See Synonyms at ambiguous.

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[Latin abstrsus, past participle of abstrdere, to hide : abs-, ab-, away; see ab-¹ + trdere, to push; see treud- in Indo-European roots.]

 

Because directions for the graphing calculator were abstruse, Aunt Ann--who is clear-- taught Isabella what she needed to know.