silentreason
nounUK /ˈsaɪlənt ˈriːzən/
US /ˈsaɪlənt ˈriːzən/
A silent reason is a reason you keep in your head and do not say out loud.
She gave a silentreason for leaving early, so nobody knew why she went.
OTHER MEANINGS
2. A cause that works without making any sound.
The silentreason for the machine stopping was a loose wire.
3. A calm, quiet way of thinking things through.
He solved the puzzle with silentreason instead of guessing.
4. A reason kept secret to avoid hurting someone's feelings.
Her silentreason for not joining the game was that she felt shy.