We don't have synonyms for dampened yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hampered, damned and dampen.
(v) :
(transitive) To make damp or moist; to make moderately wet.
(v) :
(transitive) To lessen; to dull; to make less intense (said of emotions and non-physical things).
(v) :
(intransitive) To become damp or moist.
(v) :
(intransitive) To become damped or deadened.
(v) :
(transitive, proscribed) To suppress vibrations (mechanical) or oscillations (electrical) by converting energy to heat (or some other form of energy).
(v) :
(transitive) To make damp or moist; to make moderately wet.
(v) :
(transitive) To lessen; to dull; to make less intense (said of emotions and non-physical things).
(v) :
(intransitive) To become damp or moist.
(v) :
(intransitive) To become damped or deadened.
(v) :
(transitive, proscribed) To suppress vibrations (mechanical) or oscillations (electrical) by converting energy to heat (or some other form of energy).