(grammar) perfect tense

(Internet slang, humorous) I don't know why, but I can't convert it [this hiragana] into kanji [using my IME]

compatibility with an inferior product / being better than something else in all aspects; overall superiority

thickheaded; insensitive; dull; thick-skinned

aphasia, unable to express speech

environmental pollution

indirect kiss (touching one's lips to an object that someone else has touched their lips to)

Alternative form of 間隙を生ずる

(idiomatic) to find a little leisure from a busy life; to take a short break

to develop a gap / (idiomatic) to cause an estrangement between two people