Godan verb with 'u' ending, Intransitive verbto hesitate; to waver

Godan verb with 'mu' ending, Intransitive verbto squat; to crouch

Noun, Suru verbfaltering; hesitation

Noun, Suru verbhesitation and vacillation

Expressions (phrases, clauses, etc.)without hesitation; without a qualm; at the drop of a hat