Tutoring English, vocabulary is always interesting. The tutor mentions impugn. impugn: to insult or criticize. Source: Mish, Frederic C., editor. Merriam-Webster Dictionary. Springfield:Merriam-Webster, 2004.

Tutoring English, vocabulary is always important. The tutor mentions the word rictus. rictus: a facial expression that seems to be a smile, but doesn’t suggest good feeling. It may be in reaction to shock. Source: vocabulary.com