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Synonyms for Wispy (same or very similar meaning)

WordNet sense 1 (thin and weak):
wisplike

WordNet sense 2 (lacking excess flesh):
lean, thin

WordNet sense 3 (lacking clarity or distinctness):
dim, faint, shadowy, vague

WordNet sense 4 (not clearly defined or easy to perceive or understand):
indistinct


From the ODE community, based on WordNetadd/edit