With complete sincerity, enthusiasm, and commitment, holding nothing back or giving your full support.
Compound of 'whole' (from Old English 'hal,' meaning complete) + 'hearted' (having feelings) + '-ly' (adverb suffix). The heart has symbolized genuine emotion since ancient times.
The phrase 'wholehearted' suggests your entire heart is in something, which is why it sounds so sincere—unlike 'I half-heartedly agreed' where your heart is only partly involved, showing how language tracks the difference between fake and real commitment!
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