Here's a breakdown of the meaning:
* "Tis": A shortened form of "it is," implying a state of being.
* "Full": Indicates a complete or overflowing state, suggesting the speaker is overwhelmed.
* "Anxious": Describes a state of worry, fear, or unease.
* "Care": Refers to the weight of responsibilities, concerns, and troubles.
Therefore, the phrase "tis full of anxious care" suggests that the speaker is burdened with worries and anxieties, and that this weight is constantly pressing on their mind.
This interpretation aligns with the overall theme of the poem, which encourages kindness and gentleness because even those who seem strong are likely facing their own internal struggles.