にこにこ の訳語→ brightly indulgently sweetly
にこやかに の訳語→ affably cordially friendly gaily kindly lovingly nicely personable pleasantly richly smiling
愛想のいい の訳語→ amicable cherry coy happy hopefully obsequious
愛想よく の訳語→ aggreeable charmingly cheerfully cheerily genially gregariously hearty hospitably obligingly politely sociably suavely winningly