unaided
isolate or seclude
A seven letter word that means most favorable is favorite.
A seven letter word that means a high shrill sound would be "whistle".
without
shakily
A seven (7) letter word without vowels: glycyls
Some examples of seven-letter words without vowels are rhythms, lynx, flyby, nymphs, and gypsy.
unclean...
Confide
applaud
capture
Hostile