չ-

From Old Armenian չ- (čʿ-).

• (Eastern Armenian, standard) IPA^(key): [t͡ʃʰ], [t͡ʃʰə]
• (Western Armenian, standard) IPA^(key): [t͡ʃʰ], [t͡ʃʰə]

չ- • (čʿ-)

1. a negative particle appended to the verb to form the negative conjugation of all moods, except the imperative mood

   ‎չ- (čʿ-) + ‎սիրել (sirel, “to like”) → ‎չսիրել (čʿsirel, “not to like”)

   ‎չ- (čʿ-) + ‎գրեցի (grecʿi, “I wrote”) → ‎չգրեցի (čʿgrecʿi, “I did not write”)

2. A negative prefix, appended to some verb roots

   ‎չ- (čʿ-) + ‎բերել (berel, “to bring”) → ‎չբեր (čʿber, “non-bringing, barren”)

As a negative prefix (sense 2) this is not productive anymore.

From ոչ (očʿ).

չ- • (čʿ-)

1. A negative prefix

   Աստուած ― Astuac ― God

   չաստուած ― čʿastuac ― false god

   լուր ― lur ― news

   չլուր ― čʿlur ― unheard of

   երէց ― erēcʿ ― priest

   չերէց ― čʿerēcʿ ― pseudopriest, bad or unworthy priest

• ան- (an-), տ- (t-), ապ- (ap-)

• Armenian: չ- (čʿ-)