U

boggled

verb (used with object), bog·gled, bog·gling.

to overwhelm or bewilder, as with the magnitude, complexity, or abnormality of: The speed of light boggles the mind.
to bungle; botch.

verb (used without object), bog·gled, bog·gling.

to hesitate or waver because of scruples, fear, etc.
to start or jump with fear, alarm, or surprise; shrink; shy.
to bungle awkwardly.
to be overwhelmed or bewildered.

noun

an act of shying or taking alarm.
a scruple; demur; hesitation.
bungle; botch.

verb (intr often foll by at)

to be surprised, confused, or alarmed (esp in the phrase the mind boggles)
to hesitate or be evasive when confronted with a problem
(tr) to baffle; bewilder; puzzle

1590s, “to start with fright” (as a startled horse does), from Middle English bugge “specter” (among other things, supposed to scare horses at night); see bug (n.); also cf. bogey (n.1). The meaning “to raise scruples, hesitate” is from 1630s. Related: Boggled; boggling.