wholeheartedoath
nounUK /ˌhəʊlˈhɑːtɪd əʊθ/
US /ˌhoʊlˈhɑːrtɪd oʊθ/
A promise you make with all your heart and really mean.
She made a wholehearted oath to always help her little brother.
OTHER MEANINGS
2. A serious promise made in front of others.
The knights spoke a wholehearted oath before the king.
3. A strong commitment to do something good.
His wholehearted oath to protect the forest never faded.
4. A pledge given with complete honesty and no doubts.
With a wholehearted oath, she swore to keep the secret safe.