むちゅう夢中muchuu
1.

A state of intense focus or absorption in a particular activity or thought, to the extent that one becomes oblivious to everything else around them.

2.

The condition of being deeply lost in thought or experience, akin to being in a trance where external distractions fade away.

3.

The experience of being so captivated by something, such as a hobby or pursuit, that it leads to a sense of euphoria or exhilaration, often resulting in a lack of awareness of one's surroundings.

4.

The sensation of being within a dream, either literally during sleep or metaphorically while deeply engaged in an activity, where reality seems to blur.

Example:

私は、うれしくて夢中だった。

むがむちゅう無我夢中mugamuchuu
1.

A state of being so engrossed in an activity or thought that one loses awareness of oneself and their surroundings.

2.

The experience of becoming completely immersed in a task, leading to a lack of self-consciousness or personal desire.

3.

A mental condition characterized by the absence of the self, often resulting from intense focus or passion for something, reminiscent of a meditative state.

4.

A feeling of total devotion to an endeavor, where all distractions fade away and only the task at hand remains important.

Example:

私は無我夢中で部屋を飛び出した。