Sphinxes

2 clues
Inscrutable ones.
Inscrutable people
Similar answers:
Asphixiate
Haveonesphil
Havingonesphil
Jinxes
Larynxes
Leonsphinx
Lynxes
Minxes
Padresphilscubs
Regisphilbin
Sphinx
Sphinxes
Sphinxlike
Unxes