English
imperspicuous
From im- + perspicuous.
Formed from in- + perspicuous
Proto-Indo-European *speḱ- ‘to see, to look, to observe’
…
Proto-Italic *spekjō ‘to observe, see’
Latin speciō ‘observe, watch, look at’
Latin perspiciō ‘see through’
Latin perspicuus ‘evident, manifest, perspicuous’
English perspicuous
Today it means
adj vague; unclear; lacking clarity
Language periods are conventional ranges, not dates for this word.
Etymograph / imperspicuous